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 a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: July 18th is the day in 1986 that a tornado is broadcast live on KARE television in Minnesota when the station's helicopter pilot makes a chance encounter.