331112321 has 4 divisors (see below), whose sum is σ = 338157312. Its totient is φ = 324067332.

The previous prime is 331112311. The next prime is 331112323. The reversal of 331112321 is 123211133.

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: 123211133 = 131 ⋅940543.

It is a cyclic number.

It is not a de Polignac number, because 331112321 - 2¹⁴ = 331095937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331112321.

It is not an unprimeable number, because it can be changed into a prime (331112323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3522425 + ... + 3522518.

It is an arithmetic number, because the mean of its divisors is an integer number (84539328).

Almost surely, 2^331112321 is an apocalyptic number.

It is an amenable number.

331112321 is a deficient number, since it is larger than the sum of its proper divisors (7044991).

331112321 is an equidigital number, since it uses as much as digits as its factorization.

331112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044990.

The product of its digits is 108, while the sum is 17.

The square root of 331112321 is about 18196.4919970856. The cubic root of 331112321 is about 691.8178774126.

Adding to 331112321 its reverse (123211133), we get a palindrome (454323454).

The spelling of 331112321 in words is "three hundred thirty-one million, one hundred twelve thousand, three hundred twenty-one".