91397955 has 48 divisors (see below), whose sum is σ = 165205152. Its totient is φ = 43084800.

The previous prime is 91397869. The next prime is 91397989. The reversal of 91397955 is 55979319.

It is not a de Polignac number, because 91397955 - 2⁹ = 91397443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66475 + ... + 67835.

It is an arithmetic number, because the mean of its divisors is an integer number (3441774).

Almost surely, 2^91397955 is an apocalyptic number.

91397955 is a deficient number, since it is larger than the sum of its proper divisors (73807197).

91397955 is a wasteful number, since it uses less digits than its factorization.

91397955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428 (or 1417 counting only the distinct ones).

The product of its digits is 382725, while the sum is 48.

The square root of 91397955 is about 9560.2277692532. The cubic root of 91397955 is about 450.4488607687.

The spelling of 91397955 in words is "ninety-one million, three hundred ninety-seven thousand, nine hundred fifty-five".