general_fact: 5138 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5138 is an uninteresting number.
trivia: 5138 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 24th is the day in 1946 that the United Nations General Assembly passes its first resolution to establish the United Nations Atomic Energy Commission.