Fatto matematico: 9709 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 9709 is an unremarkable number.
Data storica: July 31st is the day in 1703 that Daniel Defoe is placed in a pillory for the crime of seditious libel after publishing a politically satirical pamphlet, but is pelted with flowers.