22555409 has 2 divisors, whose sum is σ = 22555410. Its totient is φ = 22555408.

The previous prime is 22555399. The next prime is 22555411. The reversal of 22555409 is 90455522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 3441025 = 4372^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 22555409 - 2⁸ = 22555153 is a prime.

Together with 22555411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22555439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11277704 + 11277705.

It is an arithmetic number, because the mean of its divisors is an integer number (11277705).

Almost surely, 2^22555409 is an apocalyptic number.

It is an amenable number.

22555409 is a deficient number, since it is larger than the sum of its proper divisors (1).

22555409 is an equidigital number, since it uses as much as digits as its factorization.

22555409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 22555409 is about 4749.2535202914. The cubic root of 22555409 is about 282.5423603171.

The spelling of 22555409 in words is "twenty-two million, five hundred fifty-five thousand, four hundred nine".