12823131 has 4 divisors (see below), whose sum is σ = 17097512. Its totient is φ = 8548752.

The previous prime is 12823123. The next prime is 12823141. The reversal of 12823131 is 13132821.

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

It is not a de Polignac number, because 12823131 - 2³ = 12823123 is a prime.

It is a super-2 number, since 2×12823131² = 328865377286322, 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 = 12823098 and 12823107.

It is not an unprimeable number, because it can be changed into a prime (12823141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2137186 + ... + 2137191.

It is an arithmetic number, because the mean of its divisors is an integer number (4274378).

Almost surely, 2^12823131 is an apocalyptic number.

12823131 is a deficient number, since it is larger than the sum of its proper divisors (4274381).

12823131 is an equidigital number, since it uses as much as digits as its factorization.

12823131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4274380.

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

The square root of 12823131 is about 3580.9399604015. The cubic root of 12823131 is about 234.0622414604.

Adding to 12823131 its reverse (13132821), we get a palindrome (25955952).

The spelling of 12823131 in words is "twelve million, eight hundred twenty-three thousand, one hundred thirty-one".