647277229 has 2 divisors, whose sum is σ = 647277230. Its totient is φ = 647277228.

The previous prime is 647277173. The next prime is 647277263. The reversal of 647277229 is 922772746.

647277229 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., 359974729 + 287302500 = 18973^2 + 16950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647277229 is a prime.

It is a super-2 number, since 2×647277229² = 837935622363836882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647277289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323638614 + 323638615.

It is an arithmetic number, because the mean of its divisors is an integer number (323638615).

Almost surely, 2^647277229 is an apocalyptic number.

It is an amenable number.

647277229 is a deficient number, since it is larger than the sum of its proper divisors (1).

647277229 is an equidigital number, since it uses as much as digits as its factorization.

647277229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 46.

The square root of 647277229 is about 25441.6435986357. The cubic root of 647277229 is about 865.0278891071.

The spelling of 647277229 in words is "six hundred forty-seven million, two hundred seventy-seven thousand, two hundred twenty-nine".