647705417 has 2 divisors, whose sum is σ = 647705418. Its totient is φ = 647705416.

The previous prime is 647705411. The next prime is 647705419. The reversal of 647705417 is 714507746.

647705417 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., 608904976 + 38800441 = 24676^2 + 6229^2 .

It is a cyclic number.

It is not a de Polignac number, because 647705417 - 2⁶ = 647705353 is a prime.

It is a super-2 number, since 2×647705417² = 839044614422287778, which contains 22 as substring.

Together with 647705419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647705411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323852708 + 323852709.

It is an arithmetic number, because the mean of its divisors is an integer number (323852709).

Almost surely, 2^647705417 is an apocalyptic number.

It is an amenable number.

647705417 is a deficient number, since it is larger than the sum of its proper divisors (1).

647705417 is an equidigital number, since it uses as much as digits as its factorization.

647705417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 41.

The square root of 647705417 is about 25450.0573083834. The cubic root of 647705417 is about 865.2185919984.

The spelling of 647705417 in words is "six hundred forty-seven million, seven hundred five thousand, four hundred seventeen".