331001213 has 4 divisors (see below), whose sum is σ = 338043840. Its totient is φ = 323958588.

The previous prime is 331001207. The next prime is 331001233. The reversal of 331001213 is 312100133.

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: 312100133 = 23 ⋅13569571.

It is a cyclic number.

It is not a de Polignac number, because 331001213 - 2⁴ = 331001197 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 (331001233) 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 in 3 ways as a sum of consecutive naturals, for example, 3521243 + ... + 3521336.

It is an arithmetic number, because the mean of its divisors is an integer number (84510960).

Almost surely, 2^331001213 is an apocalyptic number.

It is an amenable number.

331001213 is a deficient number, since it is larger than the sum of its proper divisors (7042627).

331001213 is an equidigital number, since it uses as much as digits as its factorization.

331001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042626.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 331001213 is about 18193.4387348846. The cubic root of 331001213 is about 691.7404866550.

Adding to 331001213 its reverse (312100133), we get a palindrome (643101346).

The spelling of 331001213 in words is "three hundred thirty-one million, one thousand, two hundred thirteen".