331331213 has 2 divisors, whose sum is σ = 331331214. Its totient is φ = 331331212.

The previous prime is 331331201. The next prime is 331331251. The reversal of 331331213 is 312133133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278289124 + 53042089 = 16682^2 + 7283^2 .

It is a cyclic number.

It is not a de Polignac number, because 331331213 - 2⁶ = 331331149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331331113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165665606 + 165665607.

It is an arithmetic number, because the mean of its divisors is an integer number (165665607).

Almost surely, 2^331331213 is an apocalyptic number.

It is an amenable number.

331331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

331331213 is an equidigital number, since it uses as much as digits as its factorization.

331331213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 20.

The square root of 331331213 is about 18202.5056791641. The cubic root of 331331213 is about 691.9702930045.

Adding to 331331213 its reverse (312133133), we get a palindrome (643464346).

The spelling of 331331213 in words is "three hundred thirty-one million, three hundred thirty-one thousand, two hundred thirteen".