91805994 has 32 divisors (see below), whose sum is σ = 233159040. Its totient is φ = 26230176.

The previous prime is 91805981. The next prime is 91806007. The reversal of 91805994 is 49950819.

It is an interprime number because it is at equal distance from previous prime (91805981) and next prime (91806007).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121059 + ... + 121814.

It is an arithmetic number, because the mean of its divisors is an integer number (7286220).

Almost surely, 2^91805994 is an apocalyptic number.

91805994 is an abundant number, since it is smaller than the sum of its proper divisors (141353046).

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

91805994 is a wasteful number, since it uses less digits than its factorization.

91805994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242891 (or 242885 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 91805994 is about 9581.5444475304. The cubic root of 91805994 is about 451.1181968890.

The spelling of 91805994 in words is "ninety-one million, eight hundred five thousand, nine hundred ninety-four".