Fait mathématique: 2574 is a value of n for which _{2n}C_{n} is divisible by n^{2}.
Culture générale: 2574 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 17th is the day in 1997 that a Delta 2 carrying a GPS2R satellite explodes 13 seconds after launch, dropping 250 tons of burning rocket remains around the launch pad.