12331331 has 4 divisors (see below), whose sum is σ = 12342000. Its totient is φ = 12320664.

The previous prime is 12331309. The next prime is 12331337. The reversal of 12331331 is 13313321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12331331 - 2¹⁴ = 12314947 is a prime.

It is a super-2 number, since 2×12331331² = 304123448463122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12331337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3356 + ... + 5993.

It is an arithmetic number, because the mean of its divisors is an integer number (3085500).

Almost surely, 2^12331331 is an apocalyptic number.

12331331 is a deficient number, since it is larger than the sum of its proper divisors (10669).

12331331 is an equidigital number, since it uses as much as digits as its factorization.

12331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668.

The product of its digits is 162, while the sum is 17.

The square root of 12331331 is about 3511.5994931085. The cubic root of 12331331 is about 231.0308548704.

Adding to 12331331 its reverse (13313321), we get a palindrome (25644652).

It can be divided in two parts, 1 and 2331331, that added together give a palindrome (2331332).

The spelling of 12331331 in words is "twelve million, three hundred thirty-one thousand, three hundred thirty-one".