Fait mathématique: 55413 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 55413 is an unremarkable number.
Date historique: September 18th is the day in 2007 that Pervez Musharraf announces that he will step down as army chief and restore civilian rule to Pakistan, but only after he is re-elected president.