general_fact: 1331 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1331 is a cube containing only odd digits.
trivia: 1331 is an uninteresting number.
historical_date: August 23rd is the day in 1994 that Eugene Bullard, The only black pilot in World War I, is posthumously commissioned as Second Lieutenant in the United States Air Force.