53 (number)

← 52 54 → 53
← 50 51 52 53 54 55 56 57 58 59 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	fifty-three
Ordinal	53rd (fifty-third)
Factorization	prime
Divisors	1, 53
Roman numeral	LIII
Binary	1101012
Octal	658
Duodecimal	4512
Hexadecimal	3516

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

In mathematics

Fifty-three is the 16^th prime number. It is also an Eisenstein prime.

The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by few other numbers.^[1][2]

53 written in hexadecimal is 35, that is, the same characters used in the decimal representation, but reversed. At least four multiples of 53 share this property: 371 = 173₁₆, 5141 = 1415₁₆, 99481 =18499₁₆, and 8520280 = 820258₁₆.

53 can not be expressed as the sum of any integer and its base 10 digits, making 53 a self number.

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
• The Saros number of the solar eclipse series which began on August 26, 1295 BC and ended on February 21, 220. The duration of Saros series 53 was 1514.5 years, and it contained 85 solar eclipses.
• The Saros number of the lunar eclipse series which began on June 5, 993 BC and ended on July 12, 287 . The duration of Saros series 53 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Fifty-three is:

A Herbie replica, built by a fan

• The racing number of Herbie, a Volkswagen Beetle with a mind of his own, first appearing in the 1969 film The Love Bug
• The code for international direct dial phone calls to Cuba
• Municipal Okrug 53, a municipal okrug of Nevsky District of Saint Petersburg, Russia
• "53 Days" is a northeastern USA rock band
• Part of the title of the 1912 movie North of Fifty Three, remade in 1917
• "53 Days" a novel by Georges Perec
• Ringo Starr’s book "Postcards From the Boys" (2003) contains 53 postcards from fellow Beatles
• Fictional 53rd Precinct in the Bronx was found in the TV comedy "Car 54, Where Are You?"
• "53rd & 3rd" a song by the Ramones
• "53 Miles West of Venus” by The B-52's
• EK53 is an Estonian graffiti crew
• The number of the department in France called Mayenne
• Year identifier used on motor vehicles registered in the UK between 1 September 2003 and 28 February 2004
• The number of bytes in an Asynchronous Transfer Mode packet.
• UDP and TCP port number for the Domain Name System protocol

Sports

• F1 Stockcars (UK): John Lund's racing number is 53
• Most points by a rookie in a NBA Playoff game: 53 by Philadelphia's Wilt Chamberlain, 1960
• Most field goals (3-games series, NBA Playoff), 53 by Michael Jordan, 1992
• Utah Jazz Mark Eaton's jersey #53 is retired
• 53 national football associations are members of UEFA

Historical years

53 A.D., 53 B.C., 1953

References

1. ^ (sequence A045345 in OEIS)
2. ^ Puzzle 31.- The Average Prime number, APN(k) = S(Pk)/k from the The Prime Puzzles & Problems Connection website