general_fact: 5651 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5651 is a number n for which n, n+2, n+6, and n+8 are all prime.
trivia: 5651 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 21st is the day in 1940 that the first successful west-to-east navigation of Northwest Passage begins at Vancouver, British Columbia, Canada.