general_fact: 4153 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4153 is 4^{5} + 1^{5} + 5^{5} + 3.
trivia: 4153 is an unremarkable number.
historical_date: May 15th is the day in 1252 that Pope Innocent IV issues the papal bull ad exstirpanda, which authorizes, but also limits, the torture of heretics in the Medieval Inquisition.