Hecho general: 10513 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 10513 is an uninteresting number.
Trivia: 10513 is an unremarkable number.
Fecha histórica: October 12th is the day in 1960 that Inejiro Asanuma, Chair of the Japanese Socialist Party, is assassinated in Japan by Otoya Yamaguchi, a 17-year-old.