91630917 has 12 divisors (see below), whose sum is σ = 151263840. Its totient is φ = 52360488.

The previous prime is 91630897. The next prime is 91630933. The reversal of 91630917 is 71903619.

91630917 is a `hidden beast` number, since 9 + 1 + 630 + 9 + 17 = 666.

It is not a de Polignac number, because 91630917 - 2⁷ = 91630789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91630817) 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, 727167 + ... + 727292.

It is an arithmetic number, because the mean of its divisors is an integer number (12605320).

Almost surely, 2^91630917 is an apocalyptic number.

It is an amenable number.

91630917 is a deficient number, since it is larger than the sum of its proper divisors (59632923).

91630917 is a wasteful number, since it uses less digits than its factorization.

91630917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454472 (or 1454469 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 91630917 is about 9572.4039300481. The cubic root of 91630917 is about 450.8312487409.

The spelling of 91630917 in words is "ninety-one million, six hundred thirty thousand, nine hundred seventeen".