91975995 has 12 divisors (see below), whose sum is σ = 159425136. Its totient is φ = 49053840.

The previous prime is 91975991. The next prime is 91975999. The reversal of 91975995 is 59957919.

It is an interprime number because it is at equal distance from previous prime (91975991) and next prime (91975999).

It is not a de Polignac number, because 91975995 - 2² = 91975991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91975991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1021911 + ... + 1022000.

It is an arithmetic number, because the mean of its divisors is an integer number (13285428).

Almost surely, 2^91975995 is an apocalyptic number.

91975995 is a deficient number, since it is larger than the sum of its proper divisors (67449141).

91975995 is a wasteful number, since it uses less digits than its factorization.

91975995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043922 (or 2043919 counting only the distinct ones).

The product of its digits is 1148175, while the sum is 54.

The square root of 91975995 is about 9590.4116178608. The cubic root of 91975995 is about 451.3964766717.

The spelling of 91975995 in words is "ninety-one million, nine hundred seventy-five thousand, nine hundred ninety-five".