12644231 has 4 divisors (see below), whose sum is σ = 12858600. Its totient is φ = 12429864.

The previous prime is 12644213. The next prime is 12644237. The reversal of 12644231 is 13244621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13244621 = 13 ⋅1018817.

It is a cyclic number.

It is not a de Polignac number, because 12644231 - 2⁶ = 12644167 is a prime.

It is a super-2 number, since 2×12644231² = 319753155162722, 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 = 12644197 and 12644206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644237) 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, 107096 + ... + 107213.

It is an arithmetic number, because the mean of its divisors is an integer number (3214650).

Almost surely, 2^12644231 is an apocalyptic number.

12644231 is a deficient number, since it is larger than the sum of its proper divisors (214369).

12644231 is an equidigital number, since it uses as much as digits as its factorization.

12644231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214368.

The product of its digits is 1152, while the sum is 23.

The square root of 12644231 is about 3555.8727480043. The cubic root of 12644231 is about 232.9686450467.

Adding to 12644231 its reverse (13244621), we get a palindrome (25888852).

The spelling of 12644231 in words is "twelve million, six hundred forty-four thousand, two hundred thirty-one".