General fact: 61609 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 61609 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 61609 is an unremarkable number.
Historical date: September 4th is the day in 1951 that the first live transcontinental television broadcast takes place in San Francisco, California, from the Japanese Peace Treaty Conference.