91555596 has 72 divisors (see below), whose sum is σ = 261852864. Its totient is φ = 27740880.

The previous prime is 91555573. The next prime is 91555609. The reversal of 91555596 is 69555519.

91555596 is a `hidden beast` number, since 9 + 1 + 5 + 55 + 596 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6411 + ... + 14973.

Almost surely, 2^91555596 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91555596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130926432).

91555596 is an abundant number, since it is smaller than the sum of its proper divisors (170297268).

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

91555596 is a wasteful number, since it uses less digits than its factorization.

91555596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8593 (or 8579 counting only the distinct ones).

The product of its digits is 303750, while the sum is 45.

The square root of 91555596 is about 9568.4688430281. The cubic root of 91555596 is about 450.7076864829.

The spelling of 91555596 in words is "ninety-one million, five hundred fifty-five thousand, five hundred ninety-six".