general_fact: 8533 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 8533 is an unremarkable number.
trivia: 8533 is an uninteresting number.
historical_date: May 12th is the day in 1743 that Maria Theresa of Austria is crowned Queen of Bohemia after defeating her rival, Charles VII, Holy Roman Emperor.