647617 has 2 divisors, whose sum is σ = 647618. Its totient is φ = 647616.

The previous prime is 647609. The next prime is 647627. The reversal of 647617 is 716746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 9216 = 799^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 647617 - 2³ = 647609 is a prime.

It is not a weakly prime, because it can be changed into another prime (647627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323808 + 323809.

It is an arithmetic number, because the mean of its divisors is an integer number (323809).

2⁶⁴⁷⁶¹⁷ is an apocalyptic number.

It is an amenable number.

647617 is a deficient number, since it is larger than the sum of its proper divisors (1).

647617 is an equidigital number, since it uses as much as digits as its factorization.

647617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 647617 is about 804.7465439503. The cubic root of 647617 is about 86.5179220441.

The spelling of 647617 in words is "six hundred forty-seven thousand, six hundred seventeen".