general_fact: 23591 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 23591 is an unremarkable number.
trivia: 23591 is an uninteresting number.
historical_date: August 2nd is the day in 1937 that the Marihuana Tax Act of 1937 is passed in America, the effect of which is to render marijuana and all its by-products illegal.