general_fact: 91251 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 91251 is an uninteresting number.
trivia: 91251 is an uninteresting number.
historical_date: November 1st is the day in 1814 that Congress of Vienna opens to re-draw the European political map after the defeat of France, in the Napoleonic Wars.