647901649 has 2 divisors, whose sum is σ = 647901650. Its totient is φ = 647901648.

The previous prime is 647901629. The next prime is 647901707. The reversal of 647901649 is 946109746.

647901649 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., 637916049 + 9985600 = 25257^2 + 3160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647901649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647901599 and 647901608.

It is not a weakly prime, because it can be changed into another prime (647901619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323950824 + 323950825.

It is an arithmetic number, because the mean of its divisors is an integer number (323950825).

Almost surely, 2^647901649 is an apocalyptic number.

It is an amenable number.

647901649 is a deficient number, since it is larger than the sum of its proper divisors (1).

647901649 is an equidigital number, since it uses as much as digits as its factorization.

647901649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 647901649 is about 25453.9122533256. The cubic root of 647901649 is about 865.3059601275.

The spelling of 647901649 in words is "six hundred forty-seven million, nine hundred one thousand, six hundred forty-nine".