Fatto generale: 1997 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1997 is a prime factor of 87654321.
Trivia: 1997 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: June 19th is the day in 1770 that Emanuel Swedenborg reports the completion of the Second Coming of Christ in his work True Christian Religion.