22156879 has 2 divisors, whose sum is σ = 22156880. Its totient is φ = 22156878.

The previous prime is 22156877. The next prime is 22156913. The reversal of 22156879 is 97865122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22156879 - 2¹ = 22156877 is a prime.

Together with 22156877, it forms a pair of twin primes.

It is equal to p_1398496 and since 22156879 and 1398496 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22156877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078439 + 11078440.

It is an arithmetic number, because the mean of its divisors is an integer number (11078440).

Almost surely, 2^22156879 is an apocalyptic number.

22156879 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156879 is an equidigital number, since it uses as much as digits as its factorization.

22156879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 22156879 is about 4707.1094102432. The cubic root of 22156879 is about 280.8683881921.

The spelling of 22156879 in words is "twenty-two million, one hundred fifty-six thousand, eight hundred seventy-nine".