117 (number)

117 (one hundred [and] seventeen) is the natural number following 116 and preceding 118.

In mathematics

One hundred seventeen is the smallest possible length of the longest side of a Heronian tetrahedron (one whose sides are all rational numbers). It is also a pentagonal number and a Harshad number.

In astronomy, the Saros number of the solar eclipse series which began on 792 June 24 at 05:51:16 UT and will end on 2054 August 3 at 18:01:55 UT. The duration of Saros series 117 is 1262.11 years, and it contains 71 solar eclipses.
The Saros number of the lunar eclipse series which began on 1094 April 3 at 17:26:38 UT and will end on 2374 May 26 at 19:33:35 UT. The duration of Saros series 119 is 1280.14 years, and it contains 72 lunar eclipses.
The NGC (New General Catalog) [1] object 117, a 15th magnitude spiral galaxy in the constellation Cetus

One hundred seventeen is also:

The film format used by Kodak's first Brownie camera. See 120 film.
A substitute for the number 17, which is considered unlucky in Italy. When Renault exported the R17 to Italy, it was renamed R117.
The year AD 117 or 117 BC.
In Italy, the number to call Guardia di Finanza (police for financial crimes)
F-117A, more commonly known as the Stealth Fighter, one of the most recognizable aircraft in the United States Air Force inventory.
In the video game Halo, the main protagonist, the Master Chief's serial number is 117.