91222992 has 60 divisors (see below), whose sum is σ = 291772000. Its totient is φ = 26063424.

The previous prime is 91222973. The next prime is 91223021. The reversal of 91222992 is 29922219.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44242 + ... + 46257.

Almost surely, 2^91222992 is an apocalyptic number.

It is an amenable number.

91222992 is an abundant number, since it is smaller than the sum of its proper divisors (200549008).

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

91222992 is a wasteful number, since it uses less digits than its factorization.

91222992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90520 (or 90511 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 91222992 is about 9551.0728193224. The cubic root of 91222992 is about 450.1612459185.

The spelling of 91222992 in words is "ninety-one million, two hundred twenty-two thousand, nine hundred ninety-two".