It is the 6th Prime number.
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26 = 64
13 is not an unlucky number it is superstitious. I love the number 13
composite even deficient
Its the thirteenth number. It's abosolute value is 13. It's opposite is -13. If you add 87 to it, it equals 100. It's before 14. It's after 12. Its a natural number. 13x2 is 26. It's a real number. Its rational (it can be turned into a fraction). (Just for fun.) It is supposedly an unlucky number.
The number 11 is a prime number and it`s factors are 1 and 11