91131513 has 12 divisors (see below), whose sum is σ = 133559664. Its totient is φ = 55231000.

The previous prime is 91131511. The next prime is 91131527. The reversal of 91131513 is 31513119.

It is not a de Polignac number, because 91131513 - 2¹ = 91131511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91131511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125163 + ... + 125888.

It is an arithmetic number, because the mean of its divisors is an integer number (11129972).

Almost surely, 2^91131513 is an apocalyptic number.

It is an amenable number.

91131513 is a deficient number, since it is larger than the sum of its proper divisors (42428151).

91131513 is a wasteful number, since it uses less digits than its factorization.

91131513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251076 (or 251065 counting only the distinct ones).

The product of its digits is 405, while the sum is 24.

The square root of 91131513 is about 9546.2826796612. The cubic root of 91131513 is about 450.0107207322.

The spelling of 91131513 in words is "ninety-one million, one hundred thirty-one thousand, five hundred thirteen".