647170313 has 2 divisors, whose sum is σ = 647170314. Its totient is φ = 647170312.

The previous prime is 647170309. The next prime is 647170357. The reversal of 647170313 is 313071746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464704249 + 182466064 = 21557^2 + 13508^2 .

It is a cyclic number.

It is not a de Polignac number, because 647170313 - 2² = 647170309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647170313.

It is not a weakly prime, because it can be changed into another prime (647170373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323585156 + 323585157.

It is an arithmetic number, because the mean of its divisors is an integer number (323585157).

Almost surely, 2^647170313 is an apocalyptic number.

It is an amenable number.

647170313 is a deficient number, since it is larger than the sum of its proper divisors (1).

647170313 is an equidigital number, since it uses as much as digits as its factorization.

647170313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 647170313 is about 25439.5423111345. The cubic root of 647170313 is about 864.9802586070.

The spelling of 647170313 in words is "six hundred forty-seven million, one hundred seventy thousand, three hundred thirteen".