169 (one hundred ndsixty-nine) is the natural number following

168 Year 168 ( CLXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Apronianus and Paullus (or, less frequently, year 921 '' Ab urbe c ...

and preceding 170.

In mathematics

169 is an odd number, a

composite number A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime, ...

, and a

deficient number In number theory, a deficient number or defective number is a number ''n'' for which the sum of divisors of ''n'' is less than 2''n''. Equivalently, it is a number for which the sum of proper divisors (or aliquot sum) is less than ''n''. For ex ...

. 169 is a

square number In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself. For example, 9 is a square number, since it equals and can be written as . The usu ...

: 13 × 13 = 169, and if each number is reversed the equation is still true: 31 × 31 = 961. 144 shares this property: 12 × 12 = 144, 21 × 21 = 441. 169 is one of the few squares to also be a centered hexagonal number. Like all odd squares, it is a

centered octagonal number A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers.. The centered octagonal numbers are the same as the od ...

. 169 is an odd-indexed

Pell number In mathematics, the Pell numbers are an infinite sequence of integers, known since ancient times, that comprise the denominators of the closest rational approximations to the square root of 2. This sequence of approximations begins , , , , an ...

, thus it is also a

Markov number A Markov number or Markoff number is a positive integer ''x'', ''y'' or ''z'' that is part of a solution to the Markov Diophantine equation :x^2 + y^2 + z^2 = 3xyz,\, studied by . The first few Markov numbers are : 1, 2, 5, 13, 29, 34, 89 ...

, appearing in the solutions (2, 169, 985), (2, 29, 169), (29, 169, 14701), etc. 169 is the sum of seven consecutive

prime A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways ...

s: 13 + 17 + 19 + 23 + 29 + 31 + 37. 169 is a difference in consecutive cubes, equaling

8^3-7^3.

In astronomy

* 169 Zelia is a bright

main belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid * Gliese 169 is an

orange Orange most often refers to: *Orange (fruit), the fruit of the tree species '' Citrus'' × ''sinensis'' ** Orange blossom, its fragrant flower *Orange (colour), from the color of an orange, occurs between red and yellow in the visible spectrum * ...

, main sequence (K7 V) star in the constellation

Taurus Taurus is Latin for 'bull' and may refer to: * Taurus (astrology), the astrological sign * Taurus (constellation), one of the constellations of the zodiac * Taurus (mythology), one of two Greek mythological characters named Taurus * '' Bos tauru ...

* QSO B0307+169 is a quasar in the constellation Aries *

Sayh al Uhaymir 169 Sayh al Uhaymir 169 (SaU 169) is a 206 grams lunar meteorite found in the Sayh al Uhaymir region of the Sultanate of Oman in January 2002. This stone is an impact-melt breccia with exceedingly high concentrations of thorium and other incompatibl ...

is a 206g lunar meteorite found in

Sultanate of Oman Oman ( ; ar, عُمَان ' ), officially the Sultanate of Oman ( ar, سلْطنةُ عُمان ), is an Arabian country located in southwestern Asia. It is situated on the southeastern coast of the Arabian Peninsula, and spans the mouth of t ...

In the military

* was a

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

technical research ship during the 1960s * was a United States Navy during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...

* was a United States Navy during World War II * was a United States Navy following

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

* was a United States Navy during World War II * was a United States Navy submarine during World War II *

169th Battalion, CEF The 169th Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War. Based in Toronto, Ontario, the unit began recruiting during the winter of 1915/16 in that city. After sailing to England in October 1916, the ba ...

unit in the Canadian Expeditionary Force during the World War I * 169th Fires Brigade the

US Army National Guard The Army National Guard (ARNG), in conjunction with the Air National Guard, is an organized militia force and a federal military reserve force of the United States Army. They are simultaneously part of two different organizations: the Army N ...

artillery brigade An artillery brigade is a specialised form of military brigade dedicated to providing artillery support. Other brigades might have an artillery component, but an artillery brigade is a brigade dedicated to artillery and relying on other units fo ...

, a part of the

Colorado Army National Guard The Colorado Army National Guard is a component of the United States Army, United States National Guard, and Colorado National Guard. Nationwide, the Army National Guard comprises approximately one half of the US Army's available combat force ...

* The

United States Air Force The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...

169th Fighter Wing The 169th Fighter Wing (169 FW) is a unit of the South Carolina Air National Guard, stationed at McEntire Joint National Guard Base, Columbia, South Carolina. If activated to federal service, the Wing is gained by the United States Air Force Air ...

fighter unit at

McEntire Joint National Guard Station McEntire Joint National Guard Base or McEntire JNGB is a military airport located in Richland County, South Carolina, Richland County, South Carolina, United States, 10 miles (16 km) west of the town of Eastover, South Carolina, Eastover a ...

South Carolina )'' Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...

* 169 or 169th Squadrons **

169th Airlift Squadron The 169th Airlift Squadron (169 AS) is a unit of the Illinois Air National Guard 182d Airlift Wing located at Peoria Air National Guard Base, Peoria, Illinois. The 169th is equipped with the C-130H3 Hercules. History World War II The 304th Fig ...

, a unit of the

U.S. Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...

** Marine Light Attack Helicopter Squadron 169,

United States Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...

Light Attack Helicopter Squadron ** No. 169 Squadron RAF, a unit of the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ...

Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) an ...

In transportation

* Metro Transit Route 169 in

Seattle Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest regio ...

* 169th Street station on the IND Queens Boulevard Line of the New York City Subway served by the and trains * 169th Street was a station on the demolished

IRT Third Avenue Line The IRT Third Avenue Line, commonly known as the Third Avenue Elevated, Third Avenue El, or Bronx El, was an elevated railway in Manhattan and the Bronx, New York City. Originally operated by the New York Elevated Railway, an independent railwa ...

of the New York City Subway

In TV and radio

* The IEC 169-2 connector TV aerial plug

In other fields

169 is also: * The year AD 169 or

169 BC __NOTOC__ Year 169 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Philippus and Caepio (or, less frequently, year 585 '' Ab urbe condita''). The denomination 169 BC for this year has bee ...

* The

atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...

of an element temporarily called Unhexennium * 169 is the number of nonequivalent starting hands in the

card game A card game is any game using playing cards as the primary device with which the game is played, be they traditional or game-specific. Countless card games exist, including families of related games (such as poker). A small number of card ga ...

Texas hold 'em Texas hold 'em (also known as Texas holdem, hold 'em, and holdem) is one of the most popular variants of the card game of poker. Two cards, known as hole cards, are dealt face down to each player, and then five community cards are dealt fa ...

* 169 is known in the

computing Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes, and development of both hardware and software. Computing has scientific, ...

world as the first number of an automatic IPv4 address assigned by

TCP/IP The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the set of communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suit ...

when no external networking device is contactable *

Minuscule 169 Minuscule 169 (in the Gregory-Aland numbering), ε 305 ( Soden), is a Greek minuscule manuscript of the New Testament, on parchment. Palaeographically, it has been assigned to the 11th century.K. Aland, M. Welte, B. Köster, K. Junack, "Kurzgef ...

is a

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

minuscule Letter case is the distinction between the letters that are in larger uppercase or capitals (or more formally ''majuscule'') and smaller lowercase (or more formally ''minuscule'') in the written representation of certain languages. The writing ...

manuscript A manuscript (abbreviated MS for singular and MSS for plural) was, traditionally, any document written by hand – or, once practical typewriters became available, typewritten – as opposed to mechanically printed or reproduced in ...

of the

New Testament The New Testament grc, Ἡ Καινὴ Διαθήκη, transl. ; la, Novum Testamentum. (NT) is the second division of the Christian biblical canon. It discusses the teachings and person of Jesus, as well as events in first-century Chri ...

, on parchment

External links

Number Facts and Trivia: 169

The Positive Integer 169

The Number 169

Number Gossip 169

References

{{DEFAULTSORT:169 (Number) Integers