222645509 has 2 divisors, whose sum is σ = 222645510. Its totient is φ = 222645508.

The previous prime is 222645473. The next prime is 222645517. The reversal of 222645509 is 905546222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219484225 + 3161284 = 14815^2 + 1778^2 .

It is a cyclic number.

It is not a de Polignac number, because 222645509 - 2²⁰ = 221596933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222645559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111322754 + 111322755.

It is an arithmetic number, because the mean of its divisors is an integer number (111322755).

Almost surely, 2^222645509 is an apocalyptic number.

It is an amenable number.

222645509 is a deficient number, since it is larger than the sum of its proper divisors (1).

222645509 is an equidigital number, since it uses as much as digits as its factorization.

222645509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 222645509 is about 14921.3105657647. The cubic root of 222645509 is about 606.0912019133.

The spelling of 222645509 in words is "two hundred twenty-two million, six hundred forty-five thousand, five hundred nine".