231311331143 has 2 divisors, whose sum is σ = 231311331144. Its totient is φ = 231311331142.

The previous prime is 231311331059. The next prime is 231311331179. The reversal of 231311331143 is 341133113132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311331143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231311339143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655665571 + 115655665572.

It is an arithmetic number, because the mean of its divisors is an integer number (115655665572).

Almost surely, 2^231311331143 is an apocalyptic number.

231311331143 is a deficient number, since it is larger than the sum of its proper divisors (1).

231311331143 is an equidigital number, since it uses as much as digits as its factorization.

231311331143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

Adding to 231311331143 its reverse (341133113132), we get a palindrome (572444444275).

The spelling of 231311331143 in words is "two hundred thirty-one billion, three hundred eleven million, three hundred thirty-one thousand, one hundred forty-three".