Fatto generale: 5123 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 5123 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 5123 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: January 9th is the day in 1349 that the Jewish population of Basel, Switzerland, believed by the residents to be the cause of the ongoing Black Death, is rounded up and incinerated.