22551979 has 4 divisors (see below), whose sum is σ = 23878584. Its totient is φ = 21225376.

The previous prime is 22551961. The next prime is 22552037. The reversal of 22551979 is 97915522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97915522 = 2 ⋅48957761.

It is a cyclic number.

It is not a de Polignac number, because 22551979 - 2⁹ = 22551467 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22551929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663277 + ... + 663310.

It is an arithmetic number, because the mean of its divisors is an integer number (5969646).

Almost surely, 2^22551979 is an apocalyptic number.

22551979 is a deficient number, since it is larger than the sum of its proper divisors (1326605).

22551979 is a wasteful number, since it uses less digits than its factorization.

22551979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326604.

The product of its digits is 56700, while the sum is 40.

The square root of 22551979 is about 4748.8923971806. The cubic root of 22551979 is about 282.5280375232.

The spelling of 22551979 in words is "twenty-two million, five hundred fifty-one thousand, nine hundred seventy-nine".