13543243531 has 4 divisors (see below), whose sum is σ = 13543679952. Its totient is φ = 13542807112.

The previous prime is 13543243517. The next prime is 13543243561. The reversal of 13543243531 is 13534234531.

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 13543243531 - 2²⁵ = 13509689099 is a prime.

It is a super-2 number, since 2×13543243531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13543243501) 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, 167776 + ... + 235021.

It is an arithmetic number, because the mean of its divisors is an integer number (3385919988).

Almost surely, 2^13543243531 is an apocalyptic number.

13543243531 is a deficient number, since it is larger than the sum of its proper divisors (436421).

13543243531 is an equidigital number, since it uses as much as digits as its factorization.

13543243531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436420.

The product of its digits is 64800, while the sum is 34.

The spelling of 13543243531 in words is "thirteen billion, five hundred forty-three million, two hundred forty-three thousand, five hundred thirty-one".