647433649 has 2 divisors, whose sum is σ = 647433650. Its totient is φ = 647433648.

The previous prime is 647433623. The next prime is 647433653. The reversal of 647433649 is 946334746.

647433649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367105600 + 280328049 = 19160^2 + 16743^2 .

It is a cyclic number.

It is not a de Polignac number, because 647433649 - 2¹¹ = 647431601 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647433599 and 647433608.

It is not a weakly prime, because it can be changed into another prime (647433679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323716824 + 323716825.

It is an arithmetic number, because the mean of its divisors is an integer number (323716825).

Almost surely, 2^647433649 is an apocalyptic number.

It is an amenable number.

647433649 is a deficient number, since it is larger than the sum of its proper divisors (1).

647433649 is an equidigital number, since it uses as much as digits as its factorization.

647433649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 46.

The square root of 647433649 is about 25444.7175067832. The cubic root of 647433649 is about 865.0975639226.

The spelling of 647433649 in words is "six hundred forty-seven million, four hundred thirty-three thousand, six hundred forty-nine".