564619681 has 2 divisors, whose sum is σ = 564619682. Its totient is φ = 564619680.

The previous prime is 564619631. The next prime is 564619687. The reversal of 564619681 is 186916465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564490081 + 129600 = 23759^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 564619681 - 2⁷ = 564619553 is a prime.

It is a super-2 number, since 2×564619681² = 637590768345083522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (564619687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282309840 + 282309841.

It is an arithmetic number, because the mean of its divisors is an integer number (282309841).

Almost surely, 2^564619681 is an apocalyptic number.

It is an amenable number.

564619681 is a deficient number, since it is larger than the sum of its proper divisors (1).

564619681 is an equidigital number, since it uses as much as digits as its factorization.

564619681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 564619681 is about 23761.7272309906. The cubic root of 564619681 is about 826.5174061905.

The spelling of 564619681 in words is "five hundred sixty-four million, six hundred nineteen thousand, six hundred eighty-one".