53 (fifty-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 n ...

following 52 and preceding 54. It is the 16th

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 ...

In mathematics

*Fifty-three is the 16th

. It is also 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 ...

, an isolated prime, a

balanced prime In number theory, a balanced prime is a prime number with equal-sized prime gaps above and below it, so that it is equal to the arithmetic mean of the nearest primes above and below. Or to put it algebraically, given a prime number p_n, where is it ...

and 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 + ...

. *The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by only a few other numbers. *In

hexadecimal In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of 16. Unlike the decimal system representing numbers using 10 symbols, hexa ...

, 53 is 35, that is, the same characters used in the

decimal representation A decimal representation of a non-negative real number is its expression as a sequence of symbols consisting of decimal digits traditionally written with a single separator: r = b_k b_\ldots b_0.a_1a_2\ldots Here is the decimal separator, is ...

, but reversed. Four additional multiples of 53 share this property: 371 = , 5141 = , 99,481 = , and 8,520,280 = 0. Apart from the trivial case of single-digit decimals, no other number has this property. *53 cannot be expressed as the sum of any integer and its decimal digits, making 53 a

self number In number theory, a self number or Devlali number in a given number base b is a natural number that cannot be written as the sum of any other natural number n and the individual digits of n. 20 is a self number (in base 10), because no such combina ...

. *53 is the smallest prime number that does not divide the order of any

sporadic group In mathematics, a sporadic group is one of the 26 exceptional groups found in the classification of finite simple groups. A simple group is a group ''G'' that does not have any normal subgroups except for the trivial group and ''G'' itself. The ...

In science

*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 ...

iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...

Astronomy

Messier object The Messier objects are a set of 110 astronomical objects catalogued by the French astronomer Charles Messier in his ''Catalogue des Nébuleuses et des Amas d'Étoiles'' (''Catalogue of Nebulae and Star Clusters''). Because Messier was only int ...

M53, a

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

8.5

globular cluster A globular cluster is a spheroidal conglomeration of stars. Globular clusters are bound together by gravity, with a higher concentration of stars towards their centers. They can contain anywhere from tens of thousands to many millions of membe ...

in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Coma Berenices Coma Berenices is an ancient asterism in the northern sky, which has been defined as one of the 88 modern constellations. It is in the direction of the fourth galactic quadrant, between Leo and Boötes, and it is visible in both hemisphe ...

*The

New General Catalogue The ''New General Catalogue of Nebulae and Clusters of Stars'' (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and ...

br>object
NGC 53, a magnitude 12.6

barred spiral galaxy A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in about two thirds of all spiral galaxies, and generally affect both the motions of stars and interstellar gas within spiral galaxi ...

in the constellation

Tucana Tucana (The Toucan) is a constellation of stars in the southern sky, named after the toucan, a South American bird. It is one of twelve constellations conceived in the late sixteenth century by Petrus Plancius from the observations of Pieter D ...

In other fields

Fifty-three is: Herbie car

*The racing number of

Herbie Herbie, the Love Bug is a fictional sentient 1963 Volkswagen Beetle, who has been featured in several Walt Disney motion pictures starting with the 1968 feature film ''The Love Bug''. He has a mind of his own and is capable of driving himself, ...

, a fictional

Volkswagen Beetle The Volkswagen Beetle—officially the Volkswagen Type 1, informally in German (meaning "beetle"), in parts of the English-speaking world the Bug, and known by many other nicknames in other languages—is a two-door, rear-engine economy car, ...

with a mind of his own, first appearing in the 1968 film ''

The Love Bug ''The Love Bug'' is a 1968 American comedy film directed by Robert Stevenson and the first in a franchise by Walt Disney Productions and distributed by Buena Vista Distribution that starred an anthropomorphic pearl-white, fabric-sunroofed 19 ...

'' *The code for international direct dial phone calls to

Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribbea ...

* 53 Days is a northeastern USA rock band *''53 Days'' a novel by

Georges Perec Georges Perec (; 7 March 1936 – 3 March 1982) was a French novelist, filmmaker, documentalist, and essayist. He was a member of the Oulipo group. His father died as a soldier early in the Second World War and his mother was killed in the Holoc ...

*In ''

How the Grinch Stole Christmas! ''How the Grinch Stole Christmas!'' is a Christmas children's story by Theodor "Dr. Seuss" Geisel written in rhymed verse with illustrations by the author. It follows the Grinch, a grouchy, solitary creature who tries to cancel Christmas by st ...

'', and its animated TV special adaptation the Grinch says he's put up with the Whos' Christmas cheer for 53 years. *Fictional 53rd Precinct in

the Bronx The Bronx () is a borough of New York City, coextensive with Bronx County, in the state of New York. It is south of Westchester County; north and east of the New York City borough of Manhattan, across the Harlem River; and north of the New Y ...

was found in the TV comedy "

Car 54, Where Are You? ''Car 54, Where Are You?'' is an American sitcom that aired on NBC from September 1961 to April 1963. Filmed in black and white, the series starred Joe E. Ross as Gunther Toody and Fred Gwynne as Francis Muldoon, two mismatched New York City pol ...

" *"53rd & 3rd" a song by the

Ramones The Ramones were an American punk rock band that formed in the New York City neighborhood of Forest Hills, Queens, in 1974. They are often cited as the first true punk rock group. Despite achieving a limited commercial appeal in the United ...

*The number of

Hail Mary The Hail Mary ( la, Ave Maria) is a traditional Christian prayer addressing Mary, the mother of Jesus. The prayer is based on two biblical passages featured in the Gospel of Luke: the Angel Gabriel's visit to Mary (the Annunciation) and Mary's ...

beads on a standard, five decade

Catholic The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...

Rosary The Rosary (; la, , in the sense of "crown of roses" or "garland of roses"), also known as the Dominican Rosary, or simply the Rosary, refers to a set of prayers used primarily in the Catholic Church, and to the physical string of knots or b ...

(the Dominican Rosary). *The number of bytes in an

Asynchronous Transfer Mode Asynchronous Transfer Mode (ATM) is a telecommunications standard defined by American National Standards Institute (ANSI) and ITU-T (formerly CCITT) for digital transmission of multiple types of traffic. ATM was developed to meet the needs of ...

packet. *UDP and TCP port number for the

Domain Name System The Domain Name System (DNS) is a hierarchical and distributed naming system for computers, services, and other resources in the Internet or other Internet Protocol (IP) networks. It associates various information with domain names assigned to ...

protocol. * 53-TET (53 tone, equal temperament) is a

musical temperament In musical tuning, a temperament is a tuning system that slightly compromises the pure intervals of just intonation to meet other requirements. Most modern Western musical instruments are tuned in the equal temperament system. Tempering is the ...

that has a fifth that is closer to pure than our current system. *''53 More Things To Do In Zero Gravity'' is a book mentioned in

The Hitchhiker's Guide to the Galaxy ''The Hitchhiker's Guide to the Galaxy'' (sometimes referred to as ''HG2G'', ''HHGTTG'', ''H2G2'', or ''tHGttG'') is a comic science fiction, comedy science fiction franchise created by Douglas Adams. Originally The Hitchhiker's Guide to th ...

Sports

*The maximum number of players on a

National Football League The National Football League (NFL) is a professional American football league that consists of 32 teams, divided equally between the American Football Conference (AFC) and the National Football Conference (NFC). The NFL is one of the ...

roster *Most points by a rookie in an

NBA The National Basketball Association (NBA) is a professional basketball league in North America. The league is composed of 30 teams (29 in the United States and 1 in Canada) and is one of the major professional sports leagues in the United St ...

playoff game, by Philadelphia's

Wilt Chamberlain Wilton Norman Chamberlain (; August 21, 1936 – October 12, 1999) was an American professional basketball player who played as a Center (basketball), center. Standing at tall, he played in the National Basketball Association (NBA) for 14 yea ...

, 1960 *Most field goals (three-game series, NBA playoffs), by

Michael Jordan Michael Jeffrey Jordan (born February 17, 1963), also known by his initials MJ, is an American businessman and former professional basketball player. His biography on the official NBA website states: "By acclamation, Michael Jordan is the g ...

, 1992

References