12331031 has 4 divisors (see below), whose sum is σ = 12487200. Its totient is φ = 12174864.

The previous prime is 12330991. The next prime is 12331049. The reversal of 12331031 is 13013321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12331031 is a prime.

It is a super-2 number, since 2×12331031² = 304108651045922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12330997 and 12331015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12333031) 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, 77966 + ... + 78123.

It is an arithmetic number, because the mean of its divisors is an integer number (3121800).

It is a self-describing number.

Almost surely, 2^12331031 is an apocalyptic number.

12331031 is a deficient number, since it is larger than the sum of its proper divisors (156169).

12331031 is an equidigital number, since it uses as much as digits as its factorization.

12331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156168.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 12331031 is about 3511.5567772713. The cubic root of 12331031 is about 231.0289813279.

Adding to 12331031 its reverse (13013321), we get a palindrome (25344352).

The spelling of 12331031 in words is "twelve million, three hundred thirty-one thousand, thirty-one".