91975941 has 18 divisors (see below), whose sum is σ = 140219430. Its totient is φ = 58088016.

The previous prime is 91975921. The next prime is 91975943. The reversal of 91975941 is 14957919.

It can be written as a sum of positive squares in only one way, i.e., 76055841 + 15920100 = 8721^2 + 3990^2 .

It is not a de Polignac number, because 91975941 - 2¹⁰ = 91974917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91975943) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10906 + ... + 17403.

Almost surely, 2^91975941 is an apocalyptic number.

It is an amenable number.

91975941 is a deficient number, since it is larger than the sum of its proper divisors (48243489).

91975941 is a wasteful number, since it uses less digits than its factorization.

91975941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28353 (or 28331 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 91975941 is about 9590.4088025485. The cubic root of 91975941 is about 451.3963883320.

The spelling of 91975941 in words is "ninety-one million, nine hundred seventy-five thousand, nine hundred forty-one".