12312031 has 2 divisors, whose sum is σ = 12312032. Its totient is φ = 12312030.

The previous prime is 12312023. The next prime is 12312043. The reversal of 12312031 is 13021321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12312031 - 2³ = 12312023 is a prime.

It is a super-2 number, since 2×12312031² = 303172214689922, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 16.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156015 + 6156016.

It is an arithmetic number, because the mean of its divisors is an integer number (6156016).

Almost surely, 2^12312031 is an apocalyptic number.

12312031 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312031 is an equidigital number, since it uses as much as digits as its factorization.

12312031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12312031 is about 3508.8503815352. The cubic root of 12312031 is about 230.9102616769.

Adding to 12312031 its reverse (13021321), we get a palindrome (25333352).

The spelling of 12312031 in words is "twelve million, three hundred twelve thousand, thirty-one".