173 (one hundred ndseventy-three) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal ...

following 172 and preceding 174.

In mathematics

173 is: *an odd number. *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 ...

. *an odious number. *a balanced prime. *an

Eisenstein prime In mathematics, an Eisenstein prime is an Eisenstein integer : z = a + b\,\omega, \quad \text \quad \omega = e^, that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units , itself ...

with no imaginary part. *a

Sophie Germain prime In number theory, a prime number ''p'' is a if 2''p'' + 1 is also prime. The number 2''p'' + 1 associated with a Sophie Germain prime is called a . For example, 11 is a Sophie Germain prime and 2 × 11 + ...

. *an inconsummate number. *the sum of 2 squares: 2² + 13². *the sum of three consecutive

prime number 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: 53 + 59 + 61. * Palindromic number in bases 3 (20102₃) and 9 (212₉).

In astronomy

173 Ino Ino (minor planet designation: 173 Ino) is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately in diameter. It was discovered on 1 August 1877, by French astronomer Alphonse ...

is a large dark

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 * 173P/Mueller is a periodic

comet A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena ...

in the

Solar System The Solar System Capitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar ...

* Arp 173 (VV 296, KPG 439) is a pair of galaxies in the constellation Boötes

In the military

173rd Air Refueling Squadron The 173d Air Refueling Squadron (173d ARS) is a unit of the Nebraska Air National Guard 155th Air Refueling Wing. It is assigned to Lincoln Air National Guard Base, Nebraska and is equipped with the Boeing KC-135 Stratotanker. History World W ...

unit of the

Nebraska Air National Guard The Nebraska Air National Guard (NE ANG) is the aerial militia of the State of Nebraska, United States of America. It is, along with the Nebraska Army National Guard, an element of the Nebraska National Guard. As state militia units, the units ...

* 173rd Airborne Brigade Combat Team of the

United States Army The United States Army (USA) is the land warfare, land military branch, service branch of the United States Armed Forces. It is one of the eight Uniformed services of the United States, U.S. uniformed services, and is designated as the Army o ...

based in

Vicenza Vicenza ( , ; ) is a city in northeastern Italy. It is in the Veneto region at the northern base of the ''Monte Berico'', where it straddles the Bacchiglione River. Vicenza is approximately west of Venice and east of Milan. Vicenza is a thr ...

* 173rd Battalion unit of the Canadian Expeditionary Force during the World War I * 173rd Surveillance Squadron (Australia) of the

Australian Army The Australian Army is the principal land warfare force of Australia, a part of the Australian Defence Force (ADF) along with the Royal Australian Navy and the Royal Australian Air Force. The Army is commanded by the Chief of Army (CA), wh ...

at Oakey, Queensland * K-173 ''Chelyabinsk''

Russian Russian(s) refers to anything related to Russia, including: *Russians (, ''russkiye''), an ethnic group of the East Slavic peoples, primarily living in Russia and neighboring countries *Rossiyane (), Russian language term for all citizens and peo ...

* was a

U.S. 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 o ...

''Phoenix''-class auxiliary ship following World War II * was a U.S. Navy during World War II * was a U.S. Navy during World War II * was a U.S. Navy during World War II * was a U.S. Navy

yacht A yacht is a sailing or power vessel used for pleasure, cruising, or racing. There is no standard definition, though the term generally applies to vessels with a cabin intended for overnight use. To be termed a , as opposed to a , such a pleasu ...

during World War I * was a U.S. Navy ship during World War II * was a U.S. Navy submarine chaser during World War II * was a U.S. Navy ''Porpoise''-class submarine during World War II * was a U.S. Navy following World War II * Vought V-173 (Flying Pancake) was a U.S. Navy experimental test aircraft during World War II

In transportation

* The

Georgia Railroad Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

, the world longest railroad in 1845, ran for from Augusta to Marthasville (

Atlanta, Georgia Atlanta ( ) is the capital and most populous city of the U.S. state of Georgia. It is the seat of Fulton County, the most populous county in Georgia, but its territory falls in both Fulton and DeKalb counties. With a population of 498,7 ...

) *

United Airlines Flight 173 United Airlines Flight 173 was a scheduled flight from John F. Kennedy International Airport in New York City to Portland International Airport in Portland, Oregon, with a scheduled stop in Denver, Colorado. On December 28, 1978, the aircraft ...

en route from

Denver Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

to Portland crashed on December 28, 1978 * The Velocity 173 was a kit aircraft produced by

Velocity Aircraft Velocity, Inc. is an American kit aircraft manufacturer. The company was founded in 1984 by Danny Maher, marketing a four-seat homebuilt aircraft based on the Long-EZ design. The first prototype flew in 1985. The company was sold to Scott and ...

in the early '90s.

In popular culture

* The book " 173 Hours in Captivity" (

2000 File:2000 Events Collage.png, From left, clockwise: Protests against Bush v. Gore after the 2000 United States presidential election; Heads of state meet for the Millennium Summit; The International Space Station in its infant form as seen from S ...

) * SCP-173, a fictional statue

In other fields

173 is also: * The year AD 173 or 173 BC * 173 AH is a year in the

Islamic calendar The Hijri calendar ( ar, ٱلتَّقْوِيم ٱلْهِجْرِيّ, translit=al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 ...

that corresponds to

789 __NOTOC__ Year 789 ( DCCLXXXIX) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 789 for this year has been used since the early medieval period, when the Anno Domini calenda ...

–

790 __NOTOC__ Year 790 ( DCCXC) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 790 for this year has been used since the early medieval period, when the Anno Domini calendar era ...

CE * 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

Unsepttrium An extended periodic table theorises about chemical elements beyond those currently known in the periodic table and proven. , the element with the highest atomic number known is oganesson (''Z'' = 118), which completes the seventh period (row) ...

* Topic of discussion during the podcast " Skeptics with a K" episode 180

External links

Number Facts and Trivia: 173

Number Gossip: 173

References

{{DEFAULTSORT:173 (Number) Integers