646356329 has 2 divisors, whose sum is σ = 646356330. Its totient is φ = 646356328.

The previous prime is 646356289. The next prime is 646356331. The reversal of 646356329 is 923653646.

646356329 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., 621155929 + 25200400 = 24923^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 646356329 - 2¹⁶ = 646290793 is a prime.

Together with 646356331, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646356329.

It is not a weakly prime, because it can be changed into another prime (646356629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323178164 + 323178165.

It is an arithmetic number, because the mean of its divisors is an integer number (323178165).

Almost surely, 2^646356329 is an apocalyptic number.

It is an amenable number.

646356329 is a deficient number, since it is larger than the sum of its proper divisors (1).

646356329 is an equidigital number, since it uses as much as digits as its factorization.

646356329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 44.

The square root of 646356329 is about 25423.5388764035. The cubic root of 646356329 is about 864.6174610195.

The spelling of 646356329 in words is "six hundred forty-six million, three hundred fifty-six thousand, three hundred twenty-nine".