91317665 has 16 divisors (see below), whose sum is σ = 116430480. Its totient is φ = 68624640.

The previous prime is 91317631. The next prime is 91317683. The reversal of 91317665 is 56671319.

It can be written as a sum of positive squares in 8 ways, for example, as 19254544 + 72063121 = 4388^2 + 8489^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91317665 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 3146 + ... + 13875.

It is an arithmetic number, because the mean of its divisors is an integer number (7276905).

Almost surely, 2^91317665 is an apocalyptic number.

It is an amenable number.

91317665 is a deficient number, since it is larger than the sum of its proper divisors (25112815).

91317665 is a wasteful number, since it uses less digits than its factorization.

91317665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17092.

The product of its digits is 34020, while the sum is 38.

The square root of 91317665 is about 9556.0276789051. The cubic root of 91317665 is about 450.3169207832.

The spelling of 91317665 in words is "ninety-one million, three hundred seventeen thousand, six hundred sixty-five".