Fait mathématique: 5617 is a divisor of the sum of the 4^{th} powers of its divisors.
Culture générale: 5617 is an uninteresting number.
Date historique: May 18th is the day in 1268 that the Principality of Antioch, a crusader state, falls to the Mamluk Sultan Baibars in the Battle of Antioch.