22256639 has 2 divisors, whose sum is σ = 22256640. Its totient is φ = 22256638.

The previous prime is 22256603. The next prime is 22256651. The reversal of 22256639 is 93665222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22256639 - 2²⁰ = 21208063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22256599 and 22256608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22250639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11128319 + 11128320.

It is an arithmetic number, because the mean of its divisors is an integer number (11128320).

Almost surely, 2^22256639 is an apocalyptic number.

22256639 is a deficient number, since it is larger than the sum of its proper divisors (1).

22256639 is an equidigital number, since it uses as much as digits as its factorization.

22256639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 22256639 is about 4717.6942461334. The cubic root of 22256639 is about 281.2892880753.

The spelling of 22256639 in words is "twenty-two million, two hundred fifty-six thousand, six hundred thirty-nine".