12143231 has 4 divisors (see below), whose sum is σ = 12162264. Its totient is φ = 12124200.

The previous prime is 12143221. The next prime is 12143233. The reversal of 12143231 is 13234121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13234121 = 29 ⋅456349.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12143231 is a prime.

It is a super-2 number, since 2×12143231² = 294916118238722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8525 + ... + 9846.

It is an arithmetic number, because the mean of its divisors is an integer number (3040566).

Almost surely, 2^12143231 is an apocalyptic number.

12143231 is a deficient number, since it is larger than the sum of its proper divisors (19033).

12143231 is an equidigital number, since it uses as much as digits as its factorization.

12143231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19032.

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

The square root of 12143231 is about 3484.7139050430. The cubic root of 12143231 is about 229.8501292067.

Adding to 12143231 its reverse (13234121), we get a palindrome (25377352).

The spelling of 12143231 in words is "twelve million, one hundred forty-three thousand, two hundred thirty-one".