91128860975 has 6 divisors (see below), whose sum is σ = 112999787640. Its totient is φ = 72903088760.

The previous prime is 91128860917. The next prime is 91128860981. The reversal of 91128860975 is 57906882119.

It is not a de Polignac number, because 91128860975 - 2³⁴ = 73948991791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91128860975.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1822577195 + ... + 1822577244.

It is an arithmetic number, because the mean of its divisors is an integer number (18833297940).

Almost surely, 2^91128860975 is an apocalyptic number.

91128860975 is a deficient number, since it is larger than the sum of its proper divisors (21870926665).

91128860975 is a wasteful number, since it uses less digits than its factorization.

91128860975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645154449 (or 3645154444 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 91128860975 in words is "ninety-one billion, one hundred twenty-eight million, eight hundred sixty thousand, nine hundred seventy-five".