331122213 has 24 divisors (see below), whose sum is σ = 499297656. Its totient is φ = 211248000.

The previous prime is 331122179. The next prime is 331122223. The reversal of 331122213 is 312221133.

331122213 is a `hidden beast` number, since 331 + 122 + 213 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77739489 + 253382724 = 8817^2 + 15918^2 .

It is not a de Polignac number, because 331122213 - 2⁶ = 331122149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331122223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12163 + ... + 28463.

It is an arithmetic number, because the mean of its divisors is an integer number (20804069).

Almost surely, 2^331122213 is an apocalyptic number.

It is an amenable number.

331122213 is a deficient number, since it is larger than the sum of its proper divisors (168175443).

331122213 is a wasteful number, since it uses less digits than its factorization.

331122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16405 (or 16402 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 331122213 is about 18196.7638056881. The cubic root of 331122213 is about 691.8247667106.

Adding to 331122213 its reverse (312221133), we get a palindrome (643343346).

The spelling of 331122213 in words is "three hundred thirty-one million, one hundred twenty-two thousand, two hundred thirteen".