general_fact: 631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 631 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 631 is a boring number.
historical_date: September 22nd is the day in 1857 that the Russian warship Lefort capsizes and sinks during a storm in the Gulf of Finland, killing all 826 aboard.