225568639 has 2 divisors, whose sum is σ = 225568640. Its totient is φ = 225568638.

The previous prime is 225568619. The next prime is 225568709. The reversal of 225568639 is 936865522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225568639 - 2⁹ = 225568127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225568619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112784319 + 112784320.

It is an arithmetic number, because the mean of its divisors is an integer number (112784320).

Almost surely, 2^225568639 is an apocalyptic number.

225568639 is a deficient number, since it is larger than the sum of its proper divisors (1).

225568639 is an equidigital number, since it uses as much as digits as its factorization.

225568639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 46.

The square root of 225568639 is about 15018.9426725053. The cubic root of 225568639 is about 608.7321503339.

The spelling of 225568639 in words is "two hundred twenty-five million, five hundred sixty-eight thousand, six hundred thirty-nine".