564326981 has 2 divisors, whose sum is σ = 564326982. Its totient is φ = 564326980.

The previous prime is 564326963. The next prime is 564327013. The reversal of 564326981 is 189623465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518290756 + 46036225 = 22766^2 + 6785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-564326981 is a prime.

It is a super-2 number, since 2×564326981² = 636929882969148722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (564328981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282163490 + 282163491.

It is an arithmetic number, because the mean of its divisors is an integer number (282163491).

Almost surely, 2^564326981 is an apocalyptic number.

It is an amenable number.

564326981 is a deficient number, since it is larger than the sum of its proper divisors (1).

564326981 is an equidigital number, since it uses as much as digits as its factorization.

564326981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 564326981 is about 23755.5673685138. The cubic root of 564326981 is about 826.3745587310.

The spelling of 564326981 in words is "five hundred sixty-four million, three hundred twenty-six thousand, nine hundred eighty-one".