22331997 has 16 divisors (see below), whose sum is σ = 34152960. Its totient is φ = 14407200.

The previous prime is 22331993. The next prime is 22332041. The reversal of 22331997 is 79913322.

It is not a de Polignac number, because 22331997 - 2² = 22331993 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22331993) 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, 12504 + ... + 14177.

It is an arithmetic number, because the mean of its divisors is an integer number (2134560).

Almost surely, 2^22331997 is an apocalyptic number.

22331997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

22331997 is a deficient number, since it is larger than the sum of its proper divisors (11820963).

22331997 is a wasteful number, since it uses less digits than its factorization.

22331997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26721 (or 26715 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 22331997 is about 4725.6742376089. The cubic root of 22331997 is about 281.6063997354.

The spelling of 22331997 in words is "twenty-two million, three hundred thirty-one thousand, nine hundred ninety-seven".