564557923 has 2 divisors, whose sum is σ = 564557924. Its totient is φ = 564557922.

The previous prime is 564557921. The next prime is 564557999. The reversal of 564557923 is 329755465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 564557923 - 2¹ = 564557921 is a prime.

Together with 564557921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (564557921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282278961 + 282278962.

It is an arithmetic number, because the mean of its divisors is an integer number (282278962).

Almost surely, 2^564557923 is an apocalyptic number.

564557923 is a deficient number, since it is larger than the sum of its proper divisors (1).

564557923 is an equidigital number, since it uses as much as digits as its factorization.

564557923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 46.

The square root of 564557923 is about 23760.4276687100. The cubic root of 564557923 is about 826.4872703163.

The spelling of 564557923 in words is "five hundred sixty-four million, five hundred fifty-seven thousand, nine hundred twenty-three".