Fatto generale: 53517 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 53517 is an unremarkable number.
Trivia: 53517 is an unremarkable number.
Data storica: July 10th is the day in 1991 that the South African cricket team is readmitted into the International Cricket Council following the end of Apartheid.