Hecho general: 81973 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 81973 is an unremarkable number.
Trivia: 81973 is a boring number.
Fecha histórica: June 7th is the day in 2006 that Abu Musab al-Zarqawi, the leader of Al-Qaeda in Iraq, is killed in an airstrike by the United States Air Force.