22265991 has 12 divisors (see below), whose sum is σ = 35085960. Its totient is φ = 13494480.

The previous prime is 22265987. The next prime is 22266017. The reversal of 22265991 is 19956222.

It is a happy number.

It is not a de Polignac number, because 22265991 - 2² = 22265987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22265981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112356 + ... + 112553.

It is an arithmetic number, because the mean of its divisors is an integer number (2923830).

Almost surely, 2^22265991 is an apocalyptic number.

22265991 is a deficient number, since it is larger than the sum of its proper divisors (12819969).

22265991 is a wasteful number, since it uses less digits than its factorization.

22265991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224926 (or 224923 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 22265991 is about 4718.6853041923. The cubic root of 22265991 is about 281.3286808015.

The spelling of 22265991 in words is "twenty-two million, two hundred sixty-five thousand, nine hundred ninety-one".