646740313 has 2 divisors, whose sum is σ = 646740314. Its totient is φ = 646740312.

The previous prime is 646740301. The next prime is 646740317. The reversal of 646740313 is 313047646.

646740313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344919184 + 301821129 = 18572^2 + 17373^2 .

It is a cyclic number.

It is not a de Polignac number, because 646740313 - 2²⁹ = 109869401 is a prime.

It is not a weakly prime, because it can be changed into another prime (646740317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323370156 + 323370157.

It is an arithmetic number, because the mean of its divisors is an integer number (323370157).

Almost surely, 2^646740313 is an apocalyptic number.

It is an amenable number.

646740313 is a deficient number, since it is larger than the sum of its proper divisors (1).

646740313 is an equidigital number, since it uses as much as digits as its factorization.

646740313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 646740313 is about 25431.0894969130. The cubic root of 646740313 is about 864.7886429377.

Adding to 646740313 its reverse (313047646), we get a palindrome (959787959).

The spelling of 646740313 in words is "six hundred forty-six million, seven hundred forty thousand, three hundred thirteen".