648613313 has 2 divisors, whose sum is σ = 648613314. Its totient is φ = 648613312.

The previous prime is 648613309. The next prime is 648613321. The reversal of 648613313 is 313316846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432140944 + 216472369 = 20788^2 + 14713^2 .

It is a cyclic number.

It is not a de Polignac number, because 648613313 - 2² = 648613309 is a prime.

It is not a weakly prime, because it can be changed into another prime (648613813) 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, 324306656 + 324306657.

It is an arithmetic number, because the mean of its divisors is an integer number (324306657).

Almost surely, 2^648613313 is an apocalyptic number.

It is an amenable number.

648613313 is a deficient number, since it is larger than the sum of its proper divisors (1).

648613313 is an equidigital number, since it uses as much as digits as its factorization.

648613313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 648613313 is about 25467.8878786601. The cubic root of 648613313 is about 865.6226654839.

The spelling of 648613313 in words is "six hundred forty-eight million, six hundred thirteen thousand, three hundred thirteen".