| ||||
---|---|---|---|---|

Cardinal | fifty-three | |||

Ordinal | 53rd (fifty-third) | |||

Factorization | prime | |||

Prime | 16th | |||

Divisors | 1, 53 | |||

Greek numeral | ΝΓ´ | |||

Roman numeral | LIII | |||

Binary | 110101_{2} | |||

Ternary | 1222_{3} | |||

Quaternary | 311_{4} | |||

Quinary | 203_{5} | |||

Senary | 125_{6} | |||

Octal | 65_{8} | |||

Duodecimal | 45_{12} | |||

Hexadecimal | 35_{16} | |||

Vigesimal | 2D_{20} | |||

Base 36 | 1H_{36} |

**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 also an Eisenstein prime, and a Sophie Germain prime.^{[1]}- The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by few other numbers.
^{[2]}^{[3]} - 53 written in hexadecimal is 35, that is, the same characters used in the decimal representation, but reversed. Four additional multiples of 53 share this property: 371 = 173
_{16}, 5141 = 1415_{16}, 99481 = 18499_{16}, and 8520280 = 0820258_{16}. Apart from the trivial case of single-digit decimals, no other number has this property.^{[4]} - 53 cannot be expressed as the sum of any integer and its base-10 digits, making 53 a self number.
^{[5]} - 53 is the smallest prime number that does not divide the order of any sporadic group.

## 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 USA rock band
- "53 Days" a novel by Georges Perec
- In
*How the Grinch Stole Christmas!*, and*its animated TV special*the Grinch says he's put up with the who's 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).
^{[6]} - 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 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

## References

**^**Sloane, N. J. A. (ed.). "Sequence A005384 (Sophie Germain primes)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-05-30.**^**Sloane, N. J. A. (ed.). "Sequence A045345 (Numbers n such that n divides sum of first n primes A007504(n).)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.**^**Puzzle 31.- The Average Prime number, APN(k) = S(Pk)/k from The Prime Puzzles & Problems Connection website**^**"elementary number theory - Decimal/hex palindromes: why multiples of 53?".*Mathematics Stack Exchange*. June 16, 2015. Retrieved 29 September 2018.**^**Sloane, N. J. A. (ed.). "Sequence A003052 (Self numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-05-30.**^**https://www.rosaryworkshop.com/HISTORY-OriginPrayers.html