Hecho matemático: 5651 is a number n for which n, n+2, n+6, and n+8 are all prime.
Trivia: 5651 is a boring number.
Fecha histórica: June 21st is the day in 217 BC that the Romans, led by Gaius Flaminius, are ambushed and defeated by Hannibal at the Battle of Lake Trasimene.