Fait général: 13517 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 13517 is a boring number.
Culture générale: 13517 is an unremarkable number.
Date historique: January 2nd is the day in 1927 that Angered by the anti-clerical provisions of the Mexican Constitution of 1917, Catholic rebels in Mexico rebelled against the government.