12543445431 has 48 divisors (see below), whose sum is σ = 20539104768. Its totient is φ = 7586654400.

The previous prime is 12543445423. The next prime is 12543445451. The reversal of 12543445431 is 13454434521.

It is not a de Polignac number, because 12543445431 - 2³ = 12543445423 is a prime.

It is a super-2 number, since 2×12543445431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543445451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1388130 + ... + 1397136.

It is an arithmetic number, because the mean of its divisors is an integer number (427898016).

Almost surely, 2^12543445431 is an apocalyptic number.

12543445431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12543445431 is a deficient number, since it is larger than the sum of its proper divisors (7995659337).

12543445431 is an equidigital number, since it uses as much as digits as its factorization.

12543445431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554 (or 9542 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 12543445431 its reverse (13454434521), we get a palindrome (25997879952).

The spelling of 12543445431 in words is "twelve billion, five hundred forty-three million, four hundred forty-five thousand, four hundred thirty-one".