109

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109 is the natural number following 108 and preceding 110.

In mathematics

One hundred [and] nine is the 29th prime number, and also a Chen prime. The previous prime is 107, making them both twin primes. 109 is a centered triangular number.

109 is the smallest factor of one more than the product of the first twenty-three terms of the Euclid–Mullin sequence, making it the twenty-fourth term.

109 is the smallest number which is palindromic in bases 5 and 9.

In astronomy

• 109 Felicitas is a dark and large main belt asteroid discovered by C. H. F. Peters
• Messier 109 Messier 109 is a barred spiral galaxy in the constellation Ursa Major
• 109 Piscium is a yellow subgiant star in the constellation Pisces
• 109 Piscium b is a long-period extrasolar planet discovered in orbit around 109 Piscium
• 109 Virginis is the seventh brightest star in the constellation Virgo

In sports

• The 109th Army-Navy Game is scheduled to be played December 6, 2008 at the Lincoln Financial Field in Philadelphia
• The 109th Boston Marathon won by Hailu Negussie on April 18, 2005
• The 109th Kentucky Derby won by Sunny's Halo on May 7, 1983
• Detroit Lions running back Barry Sanders had 109 career touchdowns

In other fields

109 is also:

• The number of the Melbourne tram route 109 from Port Melbourne to Box Hill (Melbourne, Australia)
• The year AD 109 or 109 BC
• 109 AH is a year in the Islamic calendar that corresponds to 727 – 728 CE.
• The atomic number of meitnerium.
• The registry number of the famous patrol boat PT-109, commanded by John F. Kennedy.
• "PT-109" is the title of a 1962 song by Jimmy Dean
• "PT 109" is the title of a 1963 film starring Cliff Robertson
• The Messerschmitt Bf 109 was a World War II fighter
• The 109 Department Store in Shibuya, Tokyo
• Sonnet 109 by William Shakespeare
• London bus route 109 is a Transport for London contracted route in London, United Kingdom
• Bus Eireann route 109 from Dublin to Cavan, Ireland
• STS-109 was a Space Shuttle Columbia mission to service the Hubble Space Telescope in March 2002
• The meridian 109° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole
• The 109th United States Congress met from January 3, 2005 to January 3, 2007, during the administration of President George W. Bush
• BWV 109, a cantata by Johann Sebastian Bach

See also

List of highways numbered 109