91356957 has 16 divisors (see below), whose sum is σ = 137640000. Its totient is φ = 59871312.

The previous prime is 91356953. The next prime is 91356971. The reversal of 91356957 is 75965319.

It is not a de Polignac number, because 91356957 - 2² = 91356953 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91356953) 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, 27082 + ... + 30267.

It is an arithmetic number, because the mean of its divisors is an integer number (8602500).

Almost surely, 2^91356957 is an apocalyptic number.

It is an amenable number.

91356957 is a deficient number, since it is larger than the sum of its proper divisors (46283043).

91356957 is a wasteful number, since it uses less digits than its factorization.

91356957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57417 (or 57411 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 91356957 is about 9558.0833329701. The cubic root of 91356957 is about 450.3814987058.

The spelling of 91356957 in words is "ninety-one million, three hundred fifty-six thousand, nine hundred fifty-seven".