82589933

This number is a prime.

Want to memorize the number of binary digits of the 51st known Mersenne prime? Try this handy phrase by freelance math and science writer Evelyn Lamb: “Cabbages in April besmirch September asparagus. And how!” The number of letters in the word correspond to the digits of the number (82589933), and it’s easy to remember because April cabbages are indeed better than September asparagus (in the northern hemisphere).