321643013 has 2 divisors, whose sum is σ = 321643014. Its totient is φ = 321643012.

The previous prime is 321642989. The next prime is 321643019. The reversal of 321643013 is 310346123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321054724 + 588289 = 17918^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 321643013 - 2⁸ = 321642757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321643013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321643019) 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, 160821506 + 160821507.

It is an arithmetic number, because the mean of its divisors is an integer number (160821507).

Almost surely, 2^321643013 is an apocalyptic number.

It is an amenable number.

321643013 is a deficient number, since it is larger than the sum of its proper divisors (1).

321643013 is an equidigital number, since it uses as much as digits as its factorization.

321643013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 321643013 is about 17934.4086325700. The cubic root of 321643013 is about 685.1590111611.

Adding to 321643013 its reverse (310346123), we get a palindrome (631989136).

The spelling of 321643013 in words is "three hundred twenty-one million, six hundred forty-three thousand, thirteen".