91915956 has 54 divisors (see below), whose sum is σ = 255397506. Its totient is φ = 27852000.

The previous prime is 91915927. The next prime is 91915969. The reversal of 91915956 is 65951919.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 23853456 = 8250^2 + 4884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6195 + ... + 14906.

Almost surely, 2^91915956 is an apocalyptic number.

It is an amenable number.

91915956 is an abundant number, since it is smaller than the sum of its proper divisors (163481550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91915956 is a wasteful number, since it uses less digits than its factorization.

91915956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21133 (or 21117 counting only the distinct ones).

The product of its digits is 109350, while the sum is 45.

The square root of 91915956 is about 9587.2809492577. The cubic root of 91915956 is about 451.2982362117.

The spelling of 91915956 in words is "ninety-one million, nine hundred fifteen thousand, nine hundred fifty-six".