general_fact: 47137 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47137 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 47137 is an unremarkable number.
historical_date: January 20th is the day in 1992 that Air Inter Flight 148 crashes near Strasbourg, France, killing 82 passengers and five crew members.