22555217 has 2 divisors, whose sum is σ = 22555218. Its totient is φ = 22555216.

The previous prime is 22555201. The next prime is 22555229. The reversal of 22555217 is 71255522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 1615441 = 4576^2 + 1271^2 .

It is a cyclic number.

It is not a de Polignac number, because 22555217 - 2⁴ = 22555201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22555217.

It is not a weakly prime, because it can be changed into another prime (22515217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11277608 + 11277609.

It is an arithmetic number, because the mean of its divisors is an integer number (11277609).

Almost surely, 2^22555217 is an apocalyptic number.

It is an amenable number.

22555217 is a deficient number, since it is larger than the sum of its proper divisors (1).

22555217 is an equidigital number, since it uses as much as digits as its factorization.

22555217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7000, while the sum is 29.

The square root of 22555217 is about 4749.2333065454. The cubic root of 22555217 is about 282.5415586131.

The spelling of 22555217 in words is "twenty-two million, five hundred fifty-five thousand, two hundred seventeen".