Fait général: 4145 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4145 is an unremarkable number.
Culture générale: 4145 is a boring number.
Date historique: May 7th is the day in 1429 that Joan of Arc ends the Siege of Orléans, pulling an arrow from her own shoulder and returning, wounded, to lead the final charge.