12311543 has 2 divisors, whose sum is σ = 12311544. Its totient is φ = 12311542.

The previous prime is 12311539. The next prime is 12311561. The reversal of 12311543 is 34511321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12311543 - 2² = 12311539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12311503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155771 + 6155772.

It is an arithmetic number, because the mean of its divisors is an integer number (6155772).

Almost surely, 2^12311543 is an apocalyptic number.

12311543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311543 is an equidigital number, since it uses as much as digits as its factorization.

12311543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 12311543 is about 3508.7808424010. The cubic root of 12311543 is about 230.9072108481.

Adding to 12311543 its reverse (34511321), we get a palindrome (46822864).

The spelling of 12311543 in words is "twelve million, three hundred eleven thousand, five hundred forty-three".