647170393 has 2 divisors, whose sum is σ = 647170394. Its totient is φ = 647170392.

The previous prime is 647170379. The next prime is 647170427. The reversal of 647170393 is 393071746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605799769 + 41370624 = 24613^2 + 6432^2 .

It is a cyclic number.

It is not a de Polignac number, because 647170393 - 2⁵ = 647170361 is a prime.

It is not a weakly prime, because it can be changed into another prime (647170313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323585196 + 323585197.

It is an arithmetic number, because the mean of its divisors is an integer number (323585197).

Almost surely, 2^647170393 is an apocalyptic number.

It is an amenable number.

647170393 is a deficient number, since it is larger than the sum of its proper divisors (1).

647170393 is an equidigital number, since it uses as much as digits as its factorization.

647170393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 40.

The square root of 647170393 is about 25439.5438834897. The cubic root of 647170393 is about 864.9802942485.

The spelling of 647170393 in words is "six hundred forty-seven million, one hundred seventy thousand, three hundred ninety-three".