331220331 has 24 divisors (see below), whose sum is σ = 542352720. Its totient is φ = 193098816.

The previous prime is 331220311. The next prime is 331220341. The reversal of 331220331 is 133022133.

331220331 is a `hidden beast` number, since 3 + 312 + 20 + 331 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-331220331 is a prime.

It is a super-2 number, since 2×331220331² = 219413815335499122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331220311) 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, 72276 + ... + 76721.

It is an arithmetic number, because the mean of its divisors is an integer number (22598030).

Almost surely, 2^331220331 is an apocalyptic number.

331220331 is a deficient number, since it is larger than the sum of its proper divisors (211132389).

331220331 is a wasteful number, since it uses less digits than its factorization.

331220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149035 (or 149032 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 331220331 is about 18199.4596348353. The cubic root of 331220331 is about 691.8930937070.

Adding to 331220331 its reverse (133022133), we get a palindrome (464242464).

The spelling of 331220331 in words is "three hundred thirty-one million, two hundred twenty thousand, three hundred thirty-one".