22991197 has 16 divisors (see below), whose sum is σ = 25090560. Its totient is φ = 20995632.

The previous prime is 22991173. The next prime is 22991207. The reversal of 22991197 is 79119922.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 22991197 - 2⁷ = 22991069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22991167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87288 + ... + 87550.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^22991197 is an apocalyptic number.

It is an amenable number.

22991197 is a deficient number, since it is larger than the sum of its proper divisors (2099363).

22991197 is a wasteful number, since it uses less digits than its factorization.

22991197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 20412, while the sum is 40.

The square root of 22991197 is about 4794.9136592852. The cubic root of 22991197 is about 284.3504113828.

The spelling of 22991197 in words is "twenty-two million, nine hundred ninety-one thousand, one hundred ninety-seven".