222605309 has 2 divisors, whose sum is σ = 222605310. Its totient is φ = 222605308.

The previous prime is 222605269. The next prime is 222605321. The reversal of 222605309 is 903506222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193822084 + 28783225 = 13922^2 + 5365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222605309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222605329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111302654 + 111302655.

It is an arithmetic number, because the mean of its divisors is an integer number (111302655).

Almost surely, 2^222605309 is an apocalyptic number.

It is an amenable number.

222605309 is a deficient number, since it is larger than the sum of its proper divisors (1).

222605309 is an equidigital number, since it uses as much as digits as its factorization.

222605309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 222605309 is about 14919.9634382930. The cubic root of 222605309 is about 606.0547219008.

The spelling of 222605309 in words is "two hundred twenty-two million, six hundred five thousand, three hundred nine".