91075985 has 64 divisors (see below), whose sum is σ = 151732224. Its totient is φ = 50630400.

The previous prime is 91075973. The next prime is 91076003. The reversal of 91075985 is 58957019.

It is a happy number.

It is not a de Polignac number, because 91075985 - 2¹² = 91071889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 154862 + ... + 155448.

It is an arithmetic number, because the mean of its divisors is an integer number (2370816).

Almost surely, 2^91075985 is an apocalyptic number.

It is an amenable number.

91075985 is a deficient number, since it is larger than the sum of its proper divisors (60656239).

91075985 is a wasteful number, since it uses less digits than its factorization.

91075985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 91075985 is about 9543.3738792945. The cubic root of 91075985 is about 449.9193024020.

The spelling of 91075985 in words is "ninety-one million, seventy-five thousand, nine hundred eighty-five".