general_fact: 19181 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 19181 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 19181 is a boring number.
historical_date: July 6th is the day in 2006 that the Nathula Pass between India and China, sealed during the Sino-Indian War, re-opens for trade after 44 years.