Fatto generale: 17917 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 17917 is a boring number.
Trivia: 17917 is an unremarkable number.
Data storica: January 19th is the day in 1795 that the Batavian Republic is proclaimed in the Netherlands bringing to an end the Republic of the Seven United Netherlands.