646359913 has 2 divisors, whose sum is σ = 646359914. Its totient is φ = 646359912.

The previous prime is 646359881. The next prime is 646359937. The reversal of 646359913 is 319953646.

646359913 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., 372026944 + 274332969 = 19288^2 + 16563^2 .

It is a cyclic number.

It is not a de Polignac number, because 646359913 - 2⁵ = 646359881 is a prime.

It is a super-2 number, since 2×646359913² = 835562274266735138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646359943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323179956 + 323179957.

It is an arithmetic number, because the mean of its divisors is an integer number (323179957).

Almost surely, 2^646359913 is an apocalyptic number.

It is an amenable number.

646359913 is a deficient number, since it is larger than the sum of its proper divisors (1).

646359913 is an equidigital number, since it uses as much as digits as its factorization.

646359913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 46.

The square root of 646359913 is about 25423.6093621657. The cubic root of 646359913 is about 864.6190590973.

The spelling of 646359913 in words is "six hundred forty-six million, three hundred fifty-nine thousand, nine hundred thirteen".