91313957 has 16 divisors (see below), whose sum is σ = 106159872. Its totient is φ = 76930560.

The previous prime is 91313947. The next prime is 91313977. The reversal of 91313957 is 75931319.

It is not a de Polignac number, because 91313957 - 2²⁰ = 90265381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91313957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91313917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122528 + ... + 123270.

It is an arithmetic number, because the mean of its divisors is an integer number (6634992).

Almost surely, 2^91313957 is an apocalyptic number.

91313957 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

91313957 is a deficient number, since it is larger than the sum of its proper divisors (14845915).

91313957 is a wasteful number, since it uses less digits than its factorization.

91313957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028.

The product of its digits is 25515, while the sum is 38.

The square root of 91313957 is about 9555.8336632656. The cubic root of 91313957 is about 450.3108255852.

The spelling of 91313957 in words is "ninety-one million, three hundred thirteen thousand, nine hundred fifty-seven".