231042540143 has 4 divisors (see below), whose sum is σ = 231121155720. Its totient is φ = 230963924568.

The previous prime is 231042540139. The next prime is 231042540161. The reversal of 231042540143 is 341045240132.

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 231042540143 - 2² = 231042540139 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 (231042540173) 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, 39303380 + ... + 39309257.

It is an arithmetic number, because the mean of its divisors is an integer number (57780288930).

Almost surely, 2^231042540143 is an apocalyptic number.

231042540143 is a deficient number, since it is larger than the sum of its proper divisors (78615577).

231042540143 is an equidigital number, since it uses as much as digits as its factorization.

231042540143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78615576.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 231042540143 its reverse (341045240132), we get a palindrome (572087780275).

The spelling of 231042540143 in words is "two hundred thirty-one billion, forty-two million, five hundred forty thousand, one hundred forty-three".