91312865 has 48 divisors (see below), whose sum is σ = 137386368. Its totient is φ = 56867328.

The previous prime is 91312847. The next prime is 91312867. The reversal of 91312865 is 56821319.

It is not a de Polignac number, because 91312865 - 2⁸ = 91312609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (91312867) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1100114 + ... + 1100196.

It is an arithmetic number, because the mean of its divisors is an integer number (2862216).

Almost surely, 2^91312865 is an apocalyptic number.

It is an amenable number.

91312865 is a deficient number, since it is larger than the sum of its proper divisors (46073503).

91312865 is a wasteful number, since it uses less digits than its factorization.

91312865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 155 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 91312865 is about 9555.7765252228. The cubic root of 91312865 is about 450.3090305278.

The spelling of 91312865 in words is "ninety-one million, three hundred twelve thousand, eight hundred sixty-five".