What can be said about the number 13 beyond the fact that it is a prime number

The story of the number 13 that goes back to ancient Egypt is told. The mathematical significance of 13 is briefly reviewed and 13 is discussed in various contexts, with special reference to the belief of many that this number is a rather unlucky number. Contrary examples are also presented. Regarding everything, the number 13 appears to be a number that leaves no one indifferent.