math_fact: 19267 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 19267 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 30th is the day in 1954 that the U.S. Navy submarine USS Nautilus is commissioned as the world's first nuclear reactor powered vessel.