22256209 has 2 divisors, whose sum is σ = 22256210. Its totient is φ = 22256208.

The previous prime is 22256189. The next prime is 22256231. The reversal of 22256209 is 90265222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 1096209 = 4600^2 + 1047^2 .

It is a cyclic number.

It is not a de Polignac number, because 22256209 - 2⁷ = 22256081 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22256309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11128104 + 11128105.

It is an arithmetic number, because the mean of its divisors is an integer number (11128105).

Almost surely, 2^22256209 is an apocalyptic number.

It is an amenable number.

22256209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22256209 is an equidigital number, since it uses as much as digits as its factorization.

22256209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 22256209 is about 4717.6486728030. The cubic root of 22256209 is about 281.2874765534.

The spelling of 22256209 in words is "twenty-two million, two hundred fifty-six thousand, two hundred nine".