Fait général: 55431 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 55431 is an unremarkable number.
Culture générale: 55431 is a boring number.
Date historique: October 6th is the day in 1600 that Jacopo Peri's Euridice, the earliest surviving opera, receives its première performance in Florence, signifying the beginning of the Baroque Period.