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29 (Number)29 (twenty-nine) is the natural number following 28 and preceding 30. In mathematics It is the tenth prime number, and also a primorial prime, the next prime number as well as primoral prime being thirty-one, with which it comprises a twin prime. Twenty-nine is also a Sophie Germain prime. It is also the sum of three squares, 22 + 32 + 42. It is a Lucas number, a Pell number and a tetranacci number. None of the first 29 natural numbers have more than two different prime factors. This is the longest such consecutive sequence. In science In astronomy, - Messier object M29, a magnitude 9.0 open cluster in the constellation Cygnus
- The New General Catalogue object NGC 29, a spiral galaxy in the constellation Andromeda
- The Saros number of the solar eclipse series which began on -1881 March 1 and ended on -583 April 19. The duration of Saros series 29 was 1298.1 years, and it contained 73 solar eclipses.
- The Saros number of the lunar eclipse series which began on -1814 July 21 and ended on -317 January 5. The duration of Saros series 29 was 1496.5 years, and it contained 84 lunar eclipses.
- The lunar month is very close to twenty-nine days.
In other fields Twenty-nine is: 2 9
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