225565997 has 2 divisors, whose sum is σ = 225565998. Its totient is φ = 225565996.

The previous prime is 225565993. The next prime is 225566009. The reversal of 225565997 is 799565522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213773641 + 11792356 = 14621^2 + 3434^2 .

It is a cyclic number.

It is not a de Polignac number, because 225565997 - 2² = 225565993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225565993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112782998 + 112782999.

It is an arithmetic number, because the mean of its divisors is an integer number (112782999).

Almost surely, 2^225565997 is an apocalyptic number.

It is an amenable number.

225565997 is a deficient number, since it is larger than the sum of its proper divisors (1).

225565997 is an equidigital number, since it uses as much as digits as its factorization.

225565997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701000, while the sum is 50.

The square root of 225565997 is about 15018.8547166553. The cubic root of 225565997 is about 608.7297737083.

The spelling of 225565997 in words is "two hundred twenty-five million, five hundred sixty-five thousand, nine hundred ninety-seven".