648139727 has 2 divisors, whose sum is σ = 648139728. Its totient is φ = 648139726.

The previous prime is 648139711. The next prime is 648139769. The reversal of 648139727 is 727931846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648139727 - 2⁴ = 648139711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648139777) 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, 324069863 + 324069864.

It is an arithmetic number, because the mean of its divisors is an integer number (324069864).

Almost surely, 2^648139727 is an apocalyptic number.

648139727 is a deficient number, since it is larger than the sum of its proper divisors (1).

648139727 is an equidigital number, since it uses as much as digits as its factorization.

648139727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 648139727 is about 25458.5884722622. The cubic root of 648139727 is about 865.4119356174.

The spelling of 648139727 in words is "six hundred forty-eight million, one hundred thirty-nine thousand, seven hundred twenty-seven".