general_fact: 47555 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47555 is an uninteresting number.
trivia: 47555 is a boring number.
historical_date: March 14th is the day in 1964 that a jury in Dallas, Texas, finds Jack Ruby guilty of killing Lee Harvey Oswald, assumed assassin of John F. Kennedy.