222709661 has 2 divisors, whose sum is σ = 222709662. Its totient is φ = 222709660.

The previous prime is 222709609. The next prime is 222709699. The reversal of 222709661 is 166907222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 84529636 = 11755^2 + 9194^2 .

It is a cyclic number.

It is not a de Polignac number, because 222709661 - 2¹⁰ = 222708637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222709961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111354830 + 111354831.

It is an arithmetic number, because the mean of its divisors is an integer number (111354831).

Almost surely, 2^222709661 is an apocalyptic number.

It is an amenable number.

222709661 is a deficient number, since it is larger than the sum of its proper divisors (1).

222709661 is an equidigital number, since it uses as much as digits as its factorization.

222709661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 222709661 is about 14923.4600880627. The cubic root of 222709661 is about 606.1494083856.

The spelling of 222709661 in words is "two hundred twenty-two million, seven hundred nine thousand, six hundred sixty-one".