565397681 has 2 divisors, whose sum is σ = 565397682. Its totient is φ = 565397680.

The previous prime is 565397671. The next prime is 565397741. The reversal of 565397681 is 186793565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399400225 + 165997456 = 19985^2 + 12884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-565397681 is a prime.

It is a super-2 number, since 2×565397681² = 639349075360355522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (565397671) 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, 282698840 + 282698841.

It is an arithmetic number, because the mean of its divisors is an integer number (282698841).

Almost surely, 2^565397681 is an apocalyptic number.

It is an amenable number.

565397681 is a deficient number, since it is larger than the sum of its proper divisors (1).

565397681 is an equidigital number, since it uses as much as digits as its factorization.

565397681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 565397681 is about 23778.0924592365. The cubic root of 565397681 is about 826.8968565484.

The spelling of 565397681 in words is "five hundred sixty-five million, three hundred ninety-seven thousand, six hundred eighty-one".