647912017 has 2 divisors, whose sum is σ = 647912018. Its totient is φ = 647912016.

The previous prime is 647911993. The next prime is 647912021. The reversal of 647912017 is 710219746.

647912017 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., 431351361 + 216560656 = 20769^2 + 14716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647912017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647912077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323956008 + 323956009.

It is an arithmetic number, because the mean of its divisors is an integer number (323956009).

Almost surely, 2^647912017 is an apocalyptic number.

It is an amenable number.

647912017 is a deficient number, since it is larger than the sum of its proper divisors (1).

647912017 is an equidigital number, since it uses as much as digits as its factorization.

647912017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 647912017 is about 25454.1159147200. The cubic root of 647912017 is about 865.3105757686.

It can be divided in two parts, 6479 and 12017, that added together give a square (18496 = 136²).

The spelling of 647912017 in words is "six hundred forty-seven million, nine hundred twelve thousand, seventeen".