222111209 has 2 divisors, whose sum is σ = 222111210. Its totient is φ = 222111208.

The previous prime is 222111199. The next prime is 222111233. The reversal of 222111209 is 902111222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202777600 + 19333609 = 14240^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 222111209 - 2⁴ = 222111193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (222111269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111055604 + 111055605.

It is an arithmetic number, because the mean of its divisors is an integer number (111055605).

Almost surely, 2^222111209 is an apocalyptic number.

It is an amenable number.

222111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

222111209 is an equidigital number, since it uses as much as digits as its factorization.

222111209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 222111209 is about 14903.3958881860. The cubic root of 222111209 is about 605.6059852711.

The spelling of 222111209 in words is "two hundred twenty-two million, one hundred eleven thousand, two hundred nine".