91158825 has 12 divisors (see below), whose sum is σ = 150716048. Its totient is φ = 48618000.

The previous prime is 91158799. The next prime is 91158829. The reversal of 91158825 is 52885119.

It is not a de Polignac number, because 91158825 - 2⁹ = 91158313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91158829) 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, 607651 + ... + 607800.

Almost surely, 2^91158825 is an apocalyptic number.

It is an amenable number.

91158825 is a deficient number, since it is larger than the sum of its proper divisors (59557223).

91158825 is a wasteful number, since it uses less digits than its factorization.

91158825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215464 (or 1215459 counting only the distinct ones).

The product of its digits is 28800, while the sum is 39.

The square root of 91158825 is about 9547.7130769625. The cubic root of 91158825 is about 450.0556721245.

The spelling of 91158825 in words is "ninety-one million, one hundred fifty-eight thousand, eight hundred twenty-five".