Hecho matemático: 91881 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 91881 is a boring number.
Fecha histórica: July 24th is the day in 1935 that the dust bowl heat wave reaches its peak, sending temperatures to 109°F (44°C) in Chicago and 104°F (40°C) in Milwaukee, Wisconsin.