12311143 has 12 divisors (see below), whose sum is σ = 13486368. Its totient is φ = 11232000.

The previous prime is 12311137. The next prime is 12311147. The reversal of 12311143 is 34111321.

It is a de Polignac number, because none of the positive numbers 2^k-12311143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16018 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (1123864).

Almost surely, 2^12311143 is an apocalyptic number.

12311143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12311143 is a deficient number, since it is larger than the sum of its proper divisors (1175225).

12311143 is an equidigital number, since it uses as much as digits as its factorization.

12311143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 861 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 12311143 is about 3508.7238420828. The cubic root of 12311143 is about 230.9047101086.

Adding to 12311143 its reverse (34111321), we get a palindrome (46422464).

The spelling of 12311143 in words is "twelve million, three hundred eleven thousand, one hundred forty-three".