Fait général: 4571 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 4571 is an uninteresting number.
Culture générale: 4571 is a boring number.
Date historique: July 6th is the day in 1942 that Anne Frank and her family go into hiding in the "Secret Annexe" above her father's office in an Amsterdam warehouse.