general_fact: 15835 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 15835 is an uninteresting number.
trivia: 15835 is an unremarkable number.
historical_date: May 9th is the day in 1877 that a magnitude 8.8 earthquake off the coast of Peru kills 2,541, including some as far away as Hawaii and Japan.