Fait mathématique: 11573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 11573 is an uninteresting number.
Date historique: September 7th is the day in 1996 that American Hip-Hop star Tupac Shakur is fatally shot four times on the Las Vegas strip after leaving the Tyson-Seldon boxing match.