Fait mathématique: 1549 is the smallest multi-digit number that is not the sum of a prime and a non-trivial power.
Culture générale: 1549 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: March 28th is the day in 1979 that the British House of Commons passes a vote of no confidence against James Callaghan's government, precipitating a general election.