General fact: 81617 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 81617 is an uninteresting number.
Trivia: 81617 is an uninteresting number.
Historical date: June 17th is the day in 1961 that the New Democratic Party of Canada is founded by the merger of the Cooperative Commonwealth Federation and the Canadian Labour Congress.