Hecho general: 1697 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 1697 is the smallest prime factor of 26!.
Trivia: 1697 is an uninteresting number.
Fecha histórica: August 23rd is the day in 1996 that Osama bin Laden issues message entitled 'A declaration of war against the Americans occupying the land of the two holy places.