64559839 has 2 divisors, whose sum is σ = 64559840. Its totient is φ = 64559838.

The previous prime is 64559819. The next prime is 64559893. The reversal of 64559839 is 93895546.

Together with next prime (64559893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64559839 - 2⁷ = 64559711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64559792 and 64559801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64559819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32279919 + 32279920.

It is an arithmetic number, because the mean of its divisors is an integer number (32279920).

Almost surely, 2^64559839 is an apocalyptic number.

64559839 is a deficient number, since it is larger than the sum of its proper divisors (1).

64559839 is an equidigital number, since it uses as much as digits as its factorization.

64559839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 49.

The square root of 64559839 is about 8034.9137518706. The cubic root of 64559839 is about 401.1629468598.

The spelling of 64559839 in words is "sixty-four million, five hundred fifty-nine thousand, eight hundred thirty-nine".