Fait mathématique: 5671 is a triangular number that is the product of two primes.
Culture générale: 5671 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 11th is the day in 1882 that the British Mediterranean fleet begins the Bombardment of Alexandria in Egypt as part of the 1882 Anglo-Egyptian War.