564940781 has 2 divisors, whose sum is σ = 564940782. Its totient is φ = 564940780.

The previous prime is 564940777. The next prime is 564940829. The reversal of 564940781 is 187049465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 527620900 + 37319881 = 22970^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 564940781 - 2² = 564940777 is a prime.

It is a super-2 number, since 2×564940781² = 638316172073779922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_29587391 and since 564940781 and 29587391 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (564940711) 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, 282470390 + 282470391.

It is an arithmetic number, because the mean of its divisors is an integer number (282470391).

Almost surely, 2^564940781 is an apocalyptic number.

It is an amenable number.

564940781 is a deficient number, since it is larger than the sum of its proper divisors (1).

564940781 is an equidigital number, since it uses as much as digits as its factorization.

564940781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 564940781 is about 23768.4829343398. The cubic root of 564940781 is about 826.6740570323.

The spelling of 564940781 in words is "five hundred sixty-four million, nine hundred forty thousand, seven hundred eighty-one".