general_fact: 631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 631 is an uninteresting number.
trivia: 631 is an uninteresting number.
historical_date: September 22nd is the day in 1761 that George III and Charlotte of Mecklenburg-Strelitz are crowned King and Queen, respectively, of the Kingdom of Great Britain.