647277289 has 2 divisors, whose sum is σ = 647277290. Its totient is φ = 647277288.

The previous prime is 647277263. The next prime is 647277299. The reversal of 647277289 is 982772746.

647277289 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., 476112400 + 171164889 = 21820^2 + 13083^2 .

It is a cyclic number.

It is not a de Polignac number, because 647277289 - 2²⁹ = 110406377 is a prime.

It is not a weakly prime, because it can be changed into another prime (647277229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323638644 + 323638645.

It is an arithmetic number, because the mean of its divisors is an integer number (323638645).

Almost surely, 2^647277289 is an apocalyptic number.

It is an amenable number.

647277289 is a deficient number, since it is larger than the sum of its proper divisors (1).

647277289 is an equidigital number, since it uses as much as digits as its factorization.

647277289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 52.

The square root of 647277289 is about 25441.6447778048. The cubic root of 647277289 is about 865.0279158353.

The spelling of 647277289 in words is "six hundred forty-seven million, two hundred seventy-seven thousand, two hundred eighty-nine".