12143431 has 4 divisors (see below), whose sum is σ = 12562200. Its totient is φ = 11724664.

The previous prime is 12143429. The next prime is 12143441. The reversal of 12143431 is 13434121.

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

It is a cyclic number.

It is not a de Polignac number, because 12143431 - 2¹ = 12143429 is a prime.

It is a super-2 number, since 2×12143431² = 294925832903522, 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 = 12143399 and 12143408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143441) 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, 209341 + ... + 209398.

It is an arithmetic number, because the mean of its divisors is an integer number (3140550).

Almost surely, 2^12143431 is an apocalyptic number.

12143431 is a deficient number, since it is larger than the sum of its proper divisors (418769).

12143431 is an equidigital number, since it uses as much as digits as its factorization.

12143431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418768.

The product of its digits is 288, while the sum is 19.

The square root of 12143431 is about 3484.7426016852. The cubic root of 12143431 is about 229.8513910832.

Adding to 12143431 its reverse (13434121), we get a palindrome (25577552).

The spelling of 12143431 in words is "twelve million, one hundred forty-three thousand, four hundred thirty-one".