565649881 has 2 divisors, whose sum is σ = 565649882. Its totient is φ = 565649880.

The previous prime is 565649849. The next prime is 565649911. The reversal of 565649881 is 188946565.

565649881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516425625 + 49224256 = 22725^2 + 7016^2 .

It is a cyclic number.

It is not a de Polignac number, because 565649881 - 2⁵ = 565649849 is a prime.

It is a super-2 number, since 2×565649881² = 639919575750628322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (565649801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282824940 + 282824941.

It is an arithmetic number, because the mean of its divisors is an integer number (282824941).

Almost surely, 2^565649881 is an apocalyptic number.

It is an amenable number.

565649881 is a deficient number, since it is larger than the sum of its proper divisors (1).

565649881 is an equidigital number, since it uses as much as digits as its factorization.

565649881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 52.

The square root of 565649881 is about 23783.3950688290. The cubic root of 565649881 is about 827.0197861809.

The spelling of 565649881 in words is "five hundred sixty-five million, six hundred forty-nine thousand, eight hundred eighty-one".