331303213 has 2 divisors, whose sum is σ = 331303214. Its totient is φ = 331303212.

The previous prime is 331303199. The next prime is 331303223. The reversal of 331303213 is 312303133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268861609 + 62441604 = 16397^2 + 7902^2 .

It is a cyclic number.

It is not a de Polignac number, because 331303213 - 2⁹ = 331302701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331303223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165651606 + 165651607.

It is an arithmetic number, because the mean of its divisors is an integer number (165651607).

Almost surely, 2^331303213 is an apocalyptic number.

It is an amenable number.

331303213 is a deficient number, since it is larger than the sum of its proper divisors (1).

331303213 is an equidigital number, since it uses as much as digits as its factorization.

331303213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 19.

The square root of 331303213 is about 18201.7365380339. The cubic root of 331303213 is about 691.9508002097.

Adding to 331303213 its reverse (312303133), we get a palindrome (643606346).

The spelling of 331303213 in words is "three hundred thirty-one million, three hundred three thousand, two hundred thirteen".