Fait général: 5111 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 5111 is an unremarkable number.
Culture générale: 5111 is an uninteresting number.
Date historique: December 28th is the day in 1935 that Pravda publishes a letter by Pavel Postyshev, who revives New Year tree tradition in the Soviet Union.