Fait général: 83171 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 83171 is an unremarkable number.
Culture générale: 83171 is an uninteresting number.
Date historique: September 18th is the day in 324 that Constantine the Great decisively defeats Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.