Fait général: 9543 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 9543 is an unremarkable number.
Culture générale: 9543 is a boring number.
Date historique: February 15th is the day in 1961 that Sabena Flight 548 crashes in Belgium, killing 73, including the entire United States figure skating team, several coaches and family members.