Fatto generale: 85531 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 85531 is an unremarkable number.
Trivia: 85531 is a boring number.
Data storica: March 5th is the day in 1046 that Naser Khosrow begins the seven-year Middle Eastern journey which he will later describe in his book Safarnama.