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 uninteresting number.
Date historique: April 2nd is the day in 1972 that Actor Charlie Chaplin returns to the United States for the first time since being labeled a communist during the Red Scare in the early 1950s.