321331013 has 2 divisors, whose sum is σ = 321331014. Its totient is φ = 321331012.

The previous prime is 321331009. The next prime is 321331037. The reversal of 321331013 is 310133123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320517409 + 813604 = 17903^2 + 902^2 .

It is a cyclic number.

It is not a de Polignac number, because 321331013 - 2² = 321331009 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 321330982 and 321331000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321339013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160665506 + 160665507.

It is an arithmetic number, because the mean of its divisors is an integer number (160665507).

Almost surely, 2^321331013 is an apocalyptic number.

It is an amenable number.

321331013 is a deficient number, since it is larger than the sum of its proper divisors (1).

321331013 is an equidigital number, since it uses as much as digits as its factorization.

321331013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 321331013 is about 17925.7081589543. The cubic root of 321331013 is about 684.9374002858.

Adding to 321331013 its reverse (310133123), we get a palindrome (631464136).

The spelling of 321331013 in words is "three hundred twenty-one million, three hundred thirty-one thousand, thirteen".