231311431243 has 4 divisors (see below), whose sum is σ = 244917986040. Its totient is φ = 217704876448.

The previous prime is 231311431217. The next prime is 231311431259. The reversal of 231311431243 is 342134113132.

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-231311431243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311431643) 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, 6803277373 + ... + 6803277406.

It is an arithmetic number, because the mean of its divisors is an integer number (61229496510).

Almost surely, 2^231311431243 is an apocalyptic number.

231311431243 is a deficient number, since it is larger than the sum of its proper divisors (13606554797).

231311431243 is a wasteful number, since it uses less digits than its factorization.

231311431243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13606554796.

The product of its digits is 5184, while the sum is 28.

Adding to 231311431243 its reverse (342134113132), we get a palindrome (573445544375).

The spelling of 231311431243 in words is "two hundred thirty-one billion, three hundred eleven million, four hundred thirty-one thousand, two hundred forty-three".