general_fact: 86613 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 86613 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 86613 is an uninteresting number.
historical_date: February 19th is the day in 197 that Emperor Septimius Severus defeats usurper Clodius Albinus in the Battle of Lugdunum, the bloodiest battle between Roman armies.