53 (number)

53 (fifty-three) is the natural number following 52 and preceding 54. It is the 16th prime number.

In mathematics
Fifty-three is the 16th prime number. It is the second balanced prime, and fifth isolated prime.

53 is a sexy prime with 47 and 59. It is the eighth Sophie Germain prime, and the ninth Eisenstein prime.

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

53 cannot be expressed as the sum of any integer and its decimal digits, making 53 the ninth self number in decimal.

53 is the smallest prime number that does not divide the order of any sporadic group, inclusive of the six pariahs; it is also the first prime number that is not a member of Bhargava's prime-universality criterion theorem (followed by the next prime number 59), an integer-matrix quadratic form that represents all prime numbers when it represents the sequence of seventeen integers {2, ..., 47, 67, 73}.

In science

 * The atomic number of iodine

Astronomy

 * Messier object M53, a magnitude 8.5 globular cluster in the constellation Coma Berenices
 * The New General Catalogue object NGC 53, a magnitude 12.6 barred spiral galaxy in the constellation Tucana

In other fields
Fifty-three is:


 * The racing number of Herbie, a fictional Volkswagen Beetle with a mind of his own, first appearing in the 1968 film The Love Bug
 * The code for international direct dial phone calls to Cuba
 * 53 Days is a northeastern US rock band
 * 53 Days a novel by Georges Perec
 * In How the Grinch Stole Christmas!, and its animated TV special adaptation, the Grinch says he has put up with the Whos' Christmas cheer for 53 years.
 * Fictional 53rd Precinct in the Bronx was found in the TV comedy "Car 54, Where Are You?"
 * "53rd & 3rd" a song by the Ramones
 * The number of Hail Mary beads on a standard, five decade Catholic Rosary (the Dominican Rosary).
 * The number of bytes in an Asynchronous Transfer Mode packet.
 * UDP and TCP port number for the Domain Name System protocol.
 * 53-TET (53 tone, equal temperament) is a musical temperament that has a fifth that is closer to pure than our current system.
 * 53 More Things To Do In Zero Gravity is a fictional book mentioned in The Hitchhiker's Guide to the Galaxy

Sports

 * The maximum number of players on a National Football League roster
 * Most points by a rookie in an NBA playoff game, by Philadelphia's Wilt Chamberlain, 1960
 * Most field goals (three-game series, NBA playoffs), by Michael Jordan, 1992