Hecho general: 6381 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 6381 is the smallest value of n for which n and 9n together use each digit 1-9 exactly once.
Trivia: 6381 is a boring number.
Fecha histórica: June 20th is the day in 1979 that ABC News correspondent Bill Stewart is shot dead by a Nicaraguan soldier under the regime of Anastasio Somoza Debayle.