general_fact: 9123 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 9123 is an unremarkable number.
trivia: 9123 is an uninteresting number.
historical_date: December 22nd is the day in 1974 that the house of former British Prime Minister Ted Heath is attacked by members of the Provisional IRA.