12431213 has 4 divisors (see below), whose sum is σ = 12438720. Its totient is φ = 12423708.

The previous prime is 12431197. The next prime is 12431239. The reversal of 12431213 is 31213421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31213421 = 257 ⋅121453.

It is a cyclic number.

It is not a de Polignac number, because 12431213 - 2⁴ = 12431197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12431191 and 12431200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12431413) 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, 53 + ... + 4986.

It is an arithmetic number, because the mean of its divisors is an integer number (3109680).

Almost surely, 2^12431213 is an apocalyptic number.

It is an amenable number.

12431213 is a deficient number, since it is larger than the sum of its proper divisors (7507).

12431213 is an equidigital number, since it uses as much as digits as its factorization.

12431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7506.

The product of its digits is 144, while the sum is 17.

The square root of 12431213 is about 3525.7925350196. The cubic root of 12431213 is about 231.6529504384.

Adding to 12431213 its reverse (31213421), we get a palindrome (43644634).

The spelling of 12431213 in words is "twelve million, four hundred thirty-one thousand, two hundred thirteen".