131231023543 has 4 divisors (see below), whose sum is σ = 131234409040. Its totient is φ = 131227638048.

The previous prime is 131231023493. The next prime is 131231023549. The reversal of 131231023543 is 345320132131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131231023543 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 (131231023549) 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, 1633923 + ... + 1712356.

It is an arithmetic number, because the mean of its divisors is an integer number (32808602260).

Almost surely, 2^131231023543 is an apocalyptic number.

131231023543 is a deficient number, since it is larger than the sum of its proper divisors (3385497).

131231023543 is an equidigital number, since it uses as much as digits as its factorization.

131231023543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385496.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 131231023543 its reverse (345320132131), we get a palindrome (476551155674).

The spelling of 131231023543 in words is "one hundred thirty-one billion, two hundred thirty-one million, twenty-three thousand, five hundred forty-three".