331111213 has 2 divisors, whose sum is σ = 331111214. Its totient is φ = 331111212.

The previous prime is 331111211. The next prime is 331111237. The reversal of 331111213 is 312111133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282139209 + 48972004 = 16797^2 + 6998^2 .

It is a cyclic number.

It is not a de Polignac number, because 331111213 - 2¹ = 331111211 is a prime.

Together with 331111211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331111211) 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, 165555606 + 165555607.

It is an arithmetic number, because the mean of its divisors is an integer number (165555607).

Almost surely, 2^331111213 is an apocalyptic number.

It is an amenable number.

331111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

331111213 is an equidigital number, since it uses as much as digits as its factorization.

331111213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 16.

The square root of 331111213 is about 18196.4615516314. The cubic root of 331111213 is about 691.8171057358.

Adding to 331111213 its reverse (312111133), we get a palindrome (643222346).

The spelling of 331111213 in words is "three hundred thirty-one million, one hundred eleven thousand, two hundred thirteen".