Fatto generale: 117 is the serial number of protagonist John from the Halo Series.
Fatto matematico: 117 is the smallest possible value of the longest edge in a Heronian Tetrahedron.
Trivia: 117 is the substitute for the number 17, which is considered unlucky in Italy.
Data storica: April 26th is the day in 1981 that Dr. Michael R. Harrison of the University of California, San Francisco Medical Center performs the world's first human open fetal surgery.