231123331121 has 2 divisors, whose sum is σ = 231123331122. Its totient is φ = 231123331120.

The previous prime is 231123331099. The next prime is 231123331133. The reversal of 231123331121 is 121133321132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229383523600 + 1739807521 = 478940^2 + 41711^2 .

It is a cyclic number.

It is not a de Polignac number, because 231123331121 - 2¹⁸ = 231123068977 is a prime.

It is not a weakly prime, because it can be changed into another prime (231123330121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115561665560 + 115561665561.

It is an arithmetic number, because the mean of its divisors is an integer number (115561665561).

Almost surely, 2^231123331121 is an apocalyptic number.

It is an amenable number.

231123331121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231123331121 is an equidigital number, since it uses as much as digits as its factorization.

231123331121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

Adding to 231123331121 its reverse (121133321132), we get a palindrome (352256652253).

The spelling of 231123331121 in words is "two hundred thirty-one billion, one hundred twenty-three million, three hundred thirty-one thousand, one hundred twenty-one".