91975005 has 24 divisors (see below), whose sum is σ = 162819072. Its totient is φ = 48008544.

The previous prime is 91975001. The next prime is 91975021. The reversal of 91975005 is 50057919.

It is a happy number.

It is not a de Polignac number, because 91975005 - 2² = 91975001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91975001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19629 + ... + 23858.

It is an arithmetic number, because the mean of its divisors is an integer number (6784128).

Almost surely, 2^91975005 is an apocalyptic number.

It is an amenable number.

91975005 is a deficient number, since it is larger than the sum of its proper divisors (70844067).

91975005 is a wasteful number, since it uses less digits than its factorization.

91975005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43545 (or 43542 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 91975005 is about 9590.3600036704. The cubic root of 91975005 is about 451.3948571038.

The spelling of 91975005 in words is "ninety-one million, nine hundred seventy-five thousand, five".