Fatto generale: 961 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 961 is a square whose digits can be rotated to give another square.
Trivia: 961 is a boring number.
Data storica: August 18th is the day in 1920 that the Nineteenth Amendment to the United States Constitution is ratified, guaranteeing women's suffrage.