564644257 has 2 divisors, whose sum is σ = 564644258. Its totient is φ = 564644256.

The previous prime is 564644233. The next prime is 564644263. The reversal of 564644257 is 752446465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306110016 + 258534241 = 17496^2 + 16079^2 .

It is a cyclic number.

It is not a de Polignac number, because 564644257 - 2²³ = 556255649 is a prime.

It is a super-4 number, since 4×564644257⁴ (a number of 36 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (564644207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282322128 + 282322129.

It is an arithmetic number, because the mean of its divisors is an integer number (282322129).

Almost surely, 2^564644257 is an apocalyptic number.

It is an amenable number.

564644257 is a deficient number, since it is larger than the sum of its proper divisors (1).

564644257 is an equidigital number, since it uses as much as digits as its factorization.

564644257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 43.

The square root of 564644257 is about 23762.2443594876. The cubic root of 564644257 is about 826.5293978596.

The spelling of 564644257 in words is "five hundred sixty-four million, six hundred forty-four thousand, two hundred fifty-seven".