Hecho general: 9917 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 9917 is an uninteresting number.
Trivia: 9917 is an uninteresting number.
Fecha histórica: February 24th is the day in 1980 that the United States Olympic Hockey team completes their Miracle on Ice by defeating Finland 4-2 to win the gold medal.