general_fact: 1722 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1722 is a boring number.
trivia: 1722 is an uninteresting number.
historical_date: September 17th is the day in 1948 that the Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union.