91007665 has 32 divisors (see below), whose sum is σ = 131383296. Its totient is φ = 59167680.

The previous prime is 91007639. The next prime is 91007671. The reversal of 91007665 is 56670019.

It is not a de Polignac number, because 91007665 - 2⁵ = 91007633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91007665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105024 + ... + 105886.

It is an arithmetic number, because the mean of its divisors is an integer number (4105728).

Almost surely, 2^91007665 is an apocalyptic number.

It is an amenable number.

91007665 is a deficient number, since it is larger than the sum of its proper divisors (40375631).

91007665 is a wasteful number, since it uses less digits than its factorization.

91007665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 91007665 is about 9539.7937608734. The cubic root of 91007665 is about 449.8067730086.

The spelling of 91007665 in words is "ninety-one million, seven thousand, six hundred sixty-five".