231111320231 has 24 divisors (see below), whose sum is σ = 270149589360. Its totient is φ = 196878401280.

The previous prime is 231111320227. The next prime is 231111320269. The reversal of 231111320231 is 132023111132.

It is a happy number.

It is not a de Polignac number, because 231111320231 - 2² = 231111320227 is a prime.

It is a super-2 number, since 2×231111320231² (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 (231111326231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225740 + ... + 716366.

It is an arithmetic number, because the mean of its divisors is an integer number (11256232890).

Almost surely, 2^231111320231 is an apocalyptic number.

231111320231 is a deficient number, since it is larger than the sum of its proper divisors (39038269129).

231111320231 is a wasteful number, since it uses less digits than its factorization.

231111320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490895 (or 490884 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 231111320231 its reverse (132023111132), we get a palindrome (363134431363).

The spelling of 231111320231 in words is "two hundred thirty-one billion, one hundred eleven million, three hundred twenty thousand, two hundred thirty-one".