Fatto generale: 9731 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 9731 is an uninteresting number.
Trivia: 9731 is an unremarkable number.
Data storica: August 22nd is the day in 1639 that Madras (now Chennai), India, is founded by the British East India Company on a sliver of land bought from local Nayak rulers.