Fait général: 5571 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5571 is a perfect totient number.
Culture générale: 5571 is an unremarkable number.
Date historique: April 2nd is the day in 1980 that President Jimmy Carter signs the Crude Oil Windfall Profits Tax Act in an effort to help the U.S. economy rebound.