91990222 has 16 divisors (see below), whose sum is σ = 139968000. Its totient is φ = 45337600.

The previous prime is 91990211. The next prime is 91990289. The reversal of 91990222 is 22209919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79347 + ... + 80497.

It is an arithmetic number, because the mean of its divisors is an integer number (8748000).

Almost surely, 2^91990222 is an apocalyptic number.

91990222 is a deficient number, since it is larger than the sum of its proper divisors (47977778).

91990222 is a wasteful number, since it uses less digits than its factorization.

91990222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 91990222 is about 9591.1533195961. The cubic root of 91990222 is about 451.4197497246.

The spelling of 91990222 in words is "ninety-one million, nine hundred ninety thousand, two hundred twenty-two".