Hecho general: 2381 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 2381 is an unremarkable number.
Trivia: 2381 is an unremarkable number.
Fecha histórica: July 8th is the day in 1948 that the United States Air Force accepts its first female recruits into a program called Women in the Air Force (WAF).