12312831 has 4 divisors (see below), whose sum is σ = 16417112. Its totient is φ = 8208552.

The previous prime is 12312829. The next prime is 12312847. The reversal of 12312831 is 13821321.

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

It is not a de Polignac number, because 12312831 - 2¹ = 12312829 is a prime.

It is a super-2 number, since 2×12312831² = 303211614469122, 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 = 12312798 and 12312807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052136 + ... + 2052141.

It is an arithmetic number, because the mean of its divisors is an integer number (4104278).

Almost surely, 2^12312831 is an apocalyptic number.

12312831 is a deficient number, since it is larger than the sum of its proper divisors (4104281).

12312831 is an equidigital number, since it uses as much as digits as its factorization.

12312831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104280.

The product of its digits is 288, while the sum is 21.

The square root of 12312831 is about 3508.9643771347. The cubic root of 12312831 is about 230.9152628612.

The spelling of 12312831 in words is "twelve million, three hundred twelve thousand, eight hundred thirty-one".