648309439 has 2 divisors, whose sum is σ = 648309440. Its totient is φ = 648309438.

The previous prime is 648309421. The next prime is 648309457. The reversal of 648309439 is 934903846.

It is a balanced prime because it is at equal distance from previous prime (648309421) and next prime (648309457).

It is a cyclic number.

It is not a de Polignac number, because 648309439 - 2²⁵ = 614755007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648309419) 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, 324154719 + 324154720.

It is an arithmetic number, because the mean of its divisors is an integer number (324154720).

Almost surely, 2^648309439 is an apocalyptic number.

648309439 is a deficient number, since it is larger than the sum of its proper divisors (1).

648309439 is an equidigital number, since it uses as much as digits as its factorization.

648309439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 648309439 is about 25461.9213532679. The cubic root of 648309439 is about 865.4874635564.

The spelling of 648309439 in words is "six hundred forty-eight million, three hundred nine thousand, four hundred thirty-nine".