Fait mathématique: 1497 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 1497 is an uninteresting number.
Date historique: February 5th is the day in 1913 that Greek military aviators, Michael Moutoussis and Aristeidis Moraitinis perform the first naval air mission in history, with a Farman MF.7 hydroplane.