33 (number)

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← 32 33 34 →
Factorization3 × 11
Divisors1, 3, 11, 33
Greek numeralΛΓ´
Roman numeralXXXIII

33 (thirty-three) is the natural number following 32 and preceding 34.

In mathematics[edit]

33 is:

  • the largest positive integer that cannot be expressed as a sum of different triangular numbers.
  • the smallest odd repdigit that is not a prime number.
  • the sum of the first four positive factorials.
  • the sum of the sum of the divisors of the first 6 positive integers.
  • the sum of three cubes: .[1]
  • equal to the sum of the squares of the digits of its own square in bases 9, 16 and 31.
For numbers greater than 1, this is a rare property to have in more than one base.
  • the smallest integer such that it and the next two integers all have the same number of divisors.
  • the first member of the first cluster of three semiprimes (33, 34, 35); the next such cluster is 85, 86, 87.
  • the first double digit centered dodecahedral number.
  • divisible by the number of prime numbers (11) below 33.
  • a palindrome in both decimal and binary bases.

In science[edit]


  • Messier object M33, a magnitude 7.0 galaxy in the constellation Triangulum, also known as the Triangulum Galaxy.
  • The New General Catalogue object NGC 33, a double star in the constellation Pisces
  • 33 is the number of years that it takes for the Lunar phase to return to its original position in relation to the Solar calendar. A Lunar month (Synodic) contains 29.53 days. A twelve-month lunar year contains 354.36 days.[2] A solar year (Tropical year) totals 365.24 days.[3] The lunar year is therefore 10.88 days shorter than the 12-month solar year. As each year passes, the lunar month trails 10.88 days behind the solar year. On the turn of the 33rd year, the lunar month is approximately 359.04 days, close to one whole year behind the solar calendar from the original position measured, thus it has a 33-year cycle in relation to the solar year. Where the lunar year and the solar year then and . Many cultures and civilisations have based their calendar on the lunar cycles including the Athenian Attic calendar[4] and the Islamic Calendar, the Hijri calendar based on lunar observation.[5]

In technology[edit]

In religion and mythology[edit]

In sports[edit]

  • The number of innings played in the longest professional baseball game in history (a 1981 minor league game between the Rochester Red Wings and the Pawtucket Red Sox in Pawtucket, Rhode Island).[9]
  • In motorsport, 33 is the traditional number of racers in the Indianapolis 500.
  • The Big 33 Football Classic is an annual postseason high school football all-star game that features top players from Pennsylvania. In recent years, the opposition has been an all-star team from Ohio. The number 33 represents the original number of players on each squad (now 34).
  • FIBA 33 is the original name of the basketball variant now known as 3x3. It is a formalized version of half-court three-on-three basketball currently being heavily promoted by the sport's international governing body, FIBA. Under the original rules of FIBA 33, the game ended by rule once either team scored at least 33 points, with scoring following traditional basketball rules. 3x3 uses a substantially different scoring system.
  • 33 is the number of the longest winning streak in NBA History, which the Los Angeles Lakers achieved in the 1971-72 NBA Season[10]
  • World Snooker Championship semi-finals are played over 33 frames. The first rounds are played over 19 frames played in two sessions, the second round and quarter-finals played over 25 frames in three sessions, the semi-finals over 33 frames and the final over 35 frames, each played over four sessions.
  • An extra point attempt in the NFL is 33 yards since 2015.

In media[edit]

  • The number 33 is featured in Dark, a German science fiction television series following intertwined storylines over increments of 33 years.
  • The 33 is a biographical disaster film based on the real events of a mining disaster that occurred in 2010, where a group of 33 miners became trapped inside the San José Mine in Chile.[11]

In other fields[edit]

Thirty-three is:

  • A significant number in modern numerology, one of the master numbers along with 11 and 22.
  • The number printed on all Rolling Rock beer labels.
  • Pabst Blue Ribbon Beer used to be advertised as "Blended 33 to 1".
  • The namesake of the private club, Club 33, located in Disneyland's New Orleans Square.
  • The number of workers trapped, all of whom were rescued, during the 2010 Copiapó mining accident.
  • The 33 Orientales were a group of Uruguay's national Independence Heroes that liberate the country in 1825 from the Brazilian Empire, the name is due for the leaders all 33 Degree Masons (The Thirty-Three Orientals), one of Uruguay's national states and its capital city is named "Treinta y Tres" after them
  • +33 is the code for international direct-dial phone calls to France.
  • The modern Russian alphabet consists of 33 letters.[12]
  • Georgian is presently written in a 33-letter alphabet.[13]

See also[edit]


  1. ^ Booker, Andrew R. (2019). "Cracking the problem with 33". arXiv:1903.04284 [math.NT].
  2. ^ http://adsabs.harvard.edu/full/1992JHAS...23...32S The Length of the Lunar Month, Schaefer, B. E.
  3. ^ http://adsabs.harvard.edu/full/1991JRASC..85..121B The Tropical Year and Solar Calendar, Borkowski, K. M.
  4. ^ worldhistory.org The Athenian Calendar
  5. ^ https://eclipse.gsfc.nasa.gov/SEhelp/calendars.html Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann
  6. ^ Insights #517, October 8, 2010.
  7. ^ de Vries, Ad (1976). Dictionary of Symbols and Imagery. Amsterdam: North-Holland Publishing Company. pp. 462. ISBN 978-0-7204-8021-4.
  8. ^ Ghazzālī; Karim, Fazlul (1978). "Imam Gazzali's Ihya Ulum-id-din: pt. 1 and 2. The book of constructive virtues". Sind Sagar Academy. Retrieved 21 March 2018 – via Google Books.
  9. ^ "Dedicated umpire stayed at the plate for 32 innings. - Free Online Library". www.thefreelibrary.com. Retrieved 2020-08-21.
  10. ^ Cary, Tim (2015-02-14). "10 of the Longest Winning Streaks in Sports History". Sportscasting | Pure Sports. Retrieved 2020-08-21.
  11. ^ "THE 33 | British Board of Film Classification". www.bbfc.co.uk. Retrieved 2020-08-21.
  12. ^ "Russian Language Alphabet - listen online and practice pronunciation". Russian Step By Step Books Natasha Alexandrova. Retrieved 2020-08-21.
  13. ^ "Georgian Alphabet | Georgian Language, Alphabet and Pronunciation". www.ocf.berkeley.edu. Retrieved 2020-08-21.

External links[edit]