general_fact: 5243 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5243 is an unremarkable number.
trivia: 5243 is an uninteresting number.
historical_date: May 9th is the day in 1969 that Carlos Lamarca leads the first urban guerrilla action against the military dictatorship of Brazil in São Paulo, by robbing two banks.