Fatto matematico: 4583 is a value of n for which one less than the product of the first n primes is prime.
Trivia: 4583 is an unremarkable number.
Data storica: July 18th is the day in 1857 that Louis Faidherbe, French governor of Senegal, arrives to relieve French forces at Kayes, effectively ending El Hajj Umar Tall's war against the French.