Hecho general: 81917 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 81917 is a boring number.
Trivia: 81917 is an uninteresting number.
Fecha histórica: April 12th is the day in 1934 that the U.S. Auto-Lite Strike begins, culminating in a five-day melee between Ohio National Guard troops and 6,000 strikers and picketers.