117 is the smallest possible length of the longest side of an integer Heronian tetrahedron (one whose sides are all rational numbers).^[1][2]

117 is a pentagonal number.^[3]

φ(117) = φ(σ(117)).^[4]

• The atomic number of the element tennessine

• John-117, the codename for the protagonist in the Halo series.
• Canadian Sci-Fi television show First Wave had a protagonist named Cade Foster who was identified as Subject 117 by an alien race known as the Gua.

One hundred seventeen is also:

• A substitute for the number 17, which is considered unlucky in Italy. When Renault exported the R17 to Italy, it was renamed R117.^[5]
• The number to call Guardia di Finanza for customs/financial/border police in Italy
• The fire emergency telephone number in Portugal
• 1-1-7 was the national emergency telephone number in the Philippines until August 1, 2016, when it was superseded by 9-1-1.^[6]
• The police emergency telephone number in Switzerland
• F-117 is the designation of the first operational stealth attack aircraft.
• OSS 117, the codename for the fictional secret agent Hubert Bonisseur de La Bath by author Jean Bruce and later for a film series directed mostly by André Hunebelle.
• Psalm 117 is the shortest chapter of the King James version of the Bible.
• In The Mystery of Element 117 (1949) by Milton Smith, a window is opened into a new "hyperplane of hyperspace" containing those who have already died on earth.
• The Japanese telephone company NTT provides a non-free speaking clock on the nationally universal number 117.
• The 117 Catholic Martyrs of Vietnam.
• Chinese dragons are usually depicted as having 117 scales.
• In Danish the number is often used to represent a surprisingly large number.

• List of highways numbered 117