math_fact: 81722 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 81722 is an uninteresting number.
historical_date: September 30th is the day in 1791 that the National Constituent Assembly in Paris is dissolved; Parisians hail Maximilien Robespierre and Jérôme Pétion as "incorruptible patriots".