91157656 has 8 divisors (see below), whose sum is σ = 170920620. Its totient is φ = 45578824.

The previous prime is 91157629. The next prime is 91157657. The reversal of 91157656 is 65675119.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91157657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5697346 + ... + 5697361.

Almost surely, 2^91157656 is an apocalyptic number.

It is an amenable number.

91157656 is a deficient number, since it is larger than the sum of its proper divisors (79762964).

91157656 is a wasteful number, since it uses less digits than its factorization.

91157656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11394713 (or 11394709 counting only the distinct ones).

The product of its digits is 56700, while the sum is 40.

The square root of 91157656 is about 9547.6518579177. The cubic root of 91157656 is about 450.0537483125.

The spelling of 91157656 in words is "ninety-one million, one hundred fifty-seven thousand, six hundred fifty-six".