general_fact: 549 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 549 is a boring number.
trivia: 549 is an unremarkable number.
historical_date: July 2nd is the day in 1881 that Charles J. Guiteau shoots and fatally wounds U.S. President James Garfield, who eventually dies from an infection on September 19.