222638209 has 2 divisors, whose sum is σ = 222638210. Its totient is φ = 222638208.

The previous prime is 222638203. The next prime is 222638237. The reversal of 222638209 is 902836222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160275600 + 62362609 = 12660^2 + 7897^2 .

It is a cyclic number.

It is not a de Polignac number, because 222638209 - 2⁹ = 222637697 is a prime.

It is not a weakly prime, because it can be changed into another prime (222638203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111319104 + 111319105.

It is an arithmetic number, because the mean of its divisors is an integer number (111319105).

Almost surely, 2^222638209 is an apocalyptic number.

It is an amenable number.

222638209 is a deficient number, since it is larger than the sum of its proper divisors (1).

222638209 is an equidigital number, since it uses as much as digits as its factorization.

222638209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 222638209 is about 14921.0659471768. The cubic root of 222638209 is about 606.0845777597.

The spelling of 222638209 in words is "two hundred twenty-two million, six hundred thirty-eight thousand, two hundred nine".