Hecho general: 89991 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 89991 is an unremarkable number.
Trivia: 89991 is a boring number.
Fecha histórica: May 21st is the day in 1936 that Sada Abe is arrested after wandering the streets of Tokyo for days with her dead lover's severed genitals in her hand.