91005765 has 32 divisors (see below), whose sum is σ = 149700096. Its totient is φ = 47192640.

The previous prime is 91005757. The next prime is 91005781. The reversal of 91005765 is 56750019.

It is not a de Polignac number, because 91005765 - 2³ = 91005757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82870 + ... + 83960.

It is an arithmetic number, because the mean of its divisors is an integer number (4678128).

Almost surely, 2^91005765 is an apocalyptic number.

It is an amenable number.

91005765 is a deficient number, since it is larger than the sum of its proper divisors (58694331).

91005765 is a wasteful number, since it uses less digits than its factorization.

91005765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 91005765 is about 9539.6941774881. The cubic root of 91005765 is about 449.8036427271.

The spelling of 91005765 in words is "ninety-one million, five thousand, seven hundred sixty-five".