3121111331 has 8 divisors (see below), whose sum is σ = 3362441040. Its totient is φ = 2879959392.

The previous prime is 3121111321. The next prime is 3121111349. The reversal of 3121111331 is 1331111213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121111331 is a prime.

It is a super-2 number, since 2×3121111331² = 19482671880993183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121111321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6785 + ... + 79298.

It is an arithmetic number, because the mean of its divisors is an integer number (420305130).

Almost surely, 2^3121111331 is an apocalyptic number.

3121111331 is a deficient number, since it is larger than the sum of its proper divisors (241329709).

3121111331 is a wasteful number, since it uses less digits than its factorization.

3121111331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88885.

The product of its digits is 54, while the sum is 17.

The square root of 3121111331 is about 55866.9072976122. The cubic root of 3121111331 is about 1461.4021887439.

Adding to 3121111331 its reverse (1331111213), we get a palindrome (4452222544).

The spelling of 3121111331 in words is "three billion, one hundred twenty-one million, one hundred eleven thousand, three hundred thirty-one".