91660975 has 12 divisors (see below), whose sum is σ = 129896944. Its totient is φ = 62853120.

The previous prime is 91660973. The next prime is 91660999. The reversal of 91660975 is 57906619.

It is not a de Polignac number, because 91660975 - 2¹ = 91660973 is a prime.

It is a super-3 number, since 3×91660975³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91660973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261714 + ... + 262063.

Almost surely, 2^91660975 is an apocalyptic number.

91660975 is a deficient number, since it is larger than the sum of its proper divisors (38235969).

91660975 is a wasteful number, since it uses less digits than its factorization.

91660975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523794 (or 523789 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 91660975 is about 9573.9738353518. The cubic root of 91660975 is about 450.8805392520.

The spelling of 91660975 in words is "ninety-one million, six hundred sixty thousand, nine hundred seventy-five".