90991194 has 16 divisors (see below), whose sum is σ = 207979968. Its totient is φ = 25997472.

The previous prime is 90991193. The next prime is 90991213. The reversal of 90991194 is 49119909.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 2166457 = 90991194 / (9 + 0 + 9 + 9 + 1 + 1 + 9 + 4).

It is not an unprimeable number, because it can be changed into a prime (90991193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1083187 + ... + 1083270.

It is an arithmetic number, because the mean of its divisors is an integer number (12998748).

Almost surely, 2^90991194 is an apocalyptic number.

90991194 is an abundant number, since it is smaller than the sum of its proper divisors (116988774).

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

90991194 is a wasteful number, since it uses less digits than its factorization.

90991194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166469.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 90991194 is about 9538.9304431891. The cubic root of 90991194 is about 449.7796353151.

The spelling of 90991194 in words is "ninety million, nine hundred ninety-one thousand, one hundred ninety-four".