647935289 has 2 divisors, whose sum is σ = 647935290. Its totient is φ = 647935288.

The previous prime is 647935273. The next prime is 647935339. The reversal of 647935289 is 982539746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533979664 + 113955625 = 23108^2 + 10675^2 .

It is a cyclic number.

It is not a de Polignac number, because 647935289 - 2⁴ = 647935273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 647935289.

It is not a weakly prime, because it can be changed into another prime (647935889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323967644 + 323967645.

It is an arithmetic number, because the mean of its divisors is an integer number (323967645).

Almost surely, 2^647935289 is an apocalyptic number.

It is an amenable number.

647935289 is a deficient number, since it is larger than the sum of its proper divisors (1).

647935289 is an equidigital number, since it uses as much as digits as its factorization.

647935289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The square root of 647935289 is about 25454.5730469006. The cubic root of 647935289 is about 865.3209358515.

The spelling of 647935289 in words is "six hundred forty-seven million, nine hundred thirty-five thousand, two hundred eighty-nine".