Fatto generale: 81343 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 81343 is an unremarkable number.
Trivia: 81343 is an uninteresting number.
Data storica: September 16th is the day in 1978 that an earthquake measuring 7.5 to 7.9 on the Richter scale hits the city of Tabas, Iran killing about 25,000 people.