331012213 has 4 divisors (see below), whose sum is σ = 378299680. Its totient is φ = 283724748.

The previous prime is 331012193. The next prime is 331012223. The reversal of 331012213 is 312210133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312210133 = 79 ⋅3952027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331012213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331012223) 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 in 3 ways as a sum of consecutive naturals, for example, 23643723 + ... + 23643736.

It is an arithmetic number, because the mean of its divisors is an integer number (94574920).

Almost surely, 2^331012213 is an apocalyptic number.

It is an amenable number.

331012213 is a deficient number, since it is larger than the sum of its proper divisors (47287467).

331012213 is an equidigital number, since it uses as much as digits as its factorization.

331012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47287466.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 331012213 is about 18193.7410391596. The cubic root of 331012213 is about 691.7481493269.

Adding to 331012213 its reverse (312210133), we get a palindrome (643222346).

The spelling of 331012213 in words is "three hundred thirty-one million, twelve thousand, two hundred thirteen".