Fait général: 6174 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 6174 is the Kaprekar constant for 4-digit numbers.
Culture générale: 6174 is an unremarkable number.
Date historique: November 25th is the day in 1947 that New Zealand ratifies the Statute of Westminster and thus becomes independent of legislative control by the United Kingdom.