Fait général: 1689 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1689 is the smallest composite number all of whose proper divisors contain the digit 9.
Culture générale: 1689 is an uninteresting number.
Date historique: August 15th is the day in 1962 that James Joseph Dresnok defects to the Democratic People's Republic of Korea after running across the Korean DMZ.