Fatto generale: 81353 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81353 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 81353 is a boring number.
Data storica: September 26th is the day in 1997 that an earthquake strikes the Italian regions of Umbria and the Marche, causing part of the Basilica of St. Francis at Assisi to collapse.