general_fact: 19579 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 19579 is a boring number.
trivia: 19579 is an uninteresting number.
historical_date: August 8th is the day in 1709 that Bartolomeu de Gusmão demonstrates the lifting power of hot air in an audience before the King of Portugal in Lisbon.