general_fact: 597 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 597 is a value of n for which n!!!.
trivia: 597 is a boring number.
historical_date: August 19th is the day in 2002 that a Russian Mi-26 helicopter carrying troops is hit by a Chechen missile outside of Grozny, killing 118 soldiers.