general_fact: 8447 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 8447 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 8447 is a boring number.
historical_date: February 15th is the day in 1991 that the Visegrád Agreement, establishing cooperation to move toward free-market systems, is signed by the leaders of Czechoslovakia, Hungary and Poland.