Fatto generale: 15170 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 15170 is a boring number.
Trivia: 15170 is an unremarkable number.
Data storica: July 13th is the day in 1919 that the British airship R34 lands in Norfolk, England, completing the first airship return journey across the Atlantic in 182 hours of flight.