231311243111 has 4 divisors (see below), whose sum is σ = 249104415672. Its totient is φ = 213518070552.

The previous prime is 231311243047. The next prime is 231311243123. The reversal of 231311243111 is 111342113132.

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 231311243111 - 2⁶ = 231311243047 is a prime.

It is a super-2 number, since 2×231311243111² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311243161) 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, 8896586261 + ... + 8896586286.

It is an arithmetic number, because the mean of its divisors is an integer number (62276103918).

Almost surely, 2^231311243111 is an apocalyptic number.

231311243111 is a deficient number, since it is larger than the sum of its proper divisors (17793172561).

231311243111 is a wasteful number, since it uses less digits than its factorization.

231311243111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17793172560.

The product of its digits is 432, while the sum is 23.

Adding to 231311243111 its reverse (111342113132), we get a palindrome (342653356243).

The spelling of 231311243111 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred forty-three thousand, one hundred eleven".