Fatto generale: 5913 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5913 is an unremarkable number.
Trivia: 5913 is an unremarkable number.
Data storica: March 9th is the day in 1842 that the first documented discovery of gold in California occurs at Rancho San Francisco, six years before the California Gold Rush.