320531213 has 2 divisors, whose sum is σ = 320531214. Its totient is φ = 320531212.

The previous prime is 320531207. The next prime is 320531219. The reversal of 320531213 is 312135023.

It is a balanced prime because it is at equal distance from previous prime (320531207) and next prime (320531219).

It can be written as a sum of positive squares in only one way, i.e., 309654409 + 10876804 = 17597^2 + 3298^2 .

It is an emirp because it is prime and its reverse (312135023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320531213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320531219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160265606 + 160265607.

It is an arithmetic number, because the mean of its divisors is an integer number (160265607).

Almost surely, 2^320531213 is an apocalyptic number.

It is an amenable number.

320531213 is a deficient number, since it is larger than the sum of its proper divisors (1).

320531213 is an equidigital number, since it uses as much as digits as its factorization.

320531213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 320531213 is about 17903.3855178287. The cubic root of 320531213 is about 684.3686533693.

Adding to 320531213 its reverse (312135023), we get a palindrome (632666236).

The spelling of 320531213 in words is "three hundred twenty million, five hundred thirty-one thousand, two hundred thirteen".