math_fact: 86536 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 86536 is an uninteresting number.
historical_date: December 4th is the day in 1918 that U.S. President Woodrow Wilson sails for the World War I peace talks in Versailles, becoming the first US president to travel to Europe while in office.