647855933 has 2 divisors, whose sum is σ = 647855934. Its totient is φ = 647855932.

The previous prime is 647855921. The next prime is 647856061. The reversal of 647855933 is 339558746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514291684 + 133564249 = 22678^2 + 11557^2 .

It is a cyclic number.

It is not a de Polignac number, because 647855933 - 2⁶ = 647855869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647855233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323927966 + 323927967.

It is an arithmetic number, because the mean of its divisors is an integer number (323927967).

Almost surely, 2^647855933 is an apocalyptic number.

It is an amenable number.

647855933 is a deficient number, since it is larger than the sum of its proper divisors (1).

647855933 is an equidigital number, since it uses as much as digits as its factorization.

647855933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 50.

The square root of 647855933 is about 25453.0142222881. The cubic root of 647855933 is about 865.2856076261.

The spelling of 647855933 in words is "six hundred forty-seven million, eight hundred fifty-five thousand, nine hundred thirty-three".