general_fact: 18571 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 18571 is an unremarkable number.
trivia: 18571 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: November 4th is the day in 1921 that the Sturmabteilung or SA, whose members were known as "brownshirts", physically assault Adolf Hitler's opposition after his speech in Munich.