general_fact: 82651 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 82651 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 82651 is an uninteresting number.
historical_date: April 16th is the day in 1922 that the Treaty of Rapallo, pursuant to which Germany and the Soviet Union re-establish diplomatic relations, is signed.