Fatto generale: 81611 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81611 is an unremarkable number.
Trivia: 81611 is a boring number.
Data storica: June 11th is the day in 1962 that Frank Morris, John Anglin and Clarence Anglin allegedly become the only prisoners to escape from the prison on Alcatraz Island.