General fact: 86891 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 86891 is a boring number.
Trivia: 86891 is an uninteresting number.
Historical date: November 24th is the day in 1962 that the West Berlin branch of the Socialist Unity Party of Germany forms a separate party, the Socialist Unity Party of West Berlin.