648256789 has 2 divisors, whose sum is σ = 648256790. Its totient is φ = 648256788.

The previous prime is 648256787. The next prime is 648256837. The reversal of 648256789 is 987652846.

648256789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644296689 + 3960100 = 25383^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 648256789 - 2¹ = 648256787 is a prime.

Together with 648256787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648256783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324128394 + 324128395.

It is an arithmetic number, because the mean of its divisors is an integer number (324128395).

Almost surely, 2^648256789 is an apocalyptic number.

It is an amenable number.

648256789 is a deficient number, since it is larger than the sum of its proper divisors (1).

648256789 is an equidigital number, since it uses as much as digits as its factorization.

648256789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The square root of 648256789 is about 25460.8874354371. The cubic root of 648256789 is about 865.4640338247.

The spelling of 648256789 in words is "six hundred forty-eight million, two hundred fifty-six thousand, seven hundred eighty-nine".