8191 (eight thousand one hundred [and] ninety-one) is the natural number following 8190, and preceding 8192. It is also known as M13.
In mathematics 8191 is an odd number and the 1028th prime number. It is also a Jacobsthal-Lucas number. It is a palindrome and repdigit in base 2, which has 13 repeated digits of the number one.
Mersenne prime It is most notable for being a Mersenne prime. Since it is a Mersenne prime, it can be expressed as 213 - 1. And since the exponent number is prime, it is considered one. It was discovered anonymously before 1461.
See also 8191 Mersenne
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