231111311121 has 6 divisors (see below), whose sum is σ = 333827449410. Its totient is φ = 154074207408.

The previous prime is 231111311113. The next prime is 231111311141. The reversal of 231111311121 is 121113111132.

231111311121 is a `hidden beast` number, since 231 + 1 + 1 + 1 + 311 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 227071310400 + 4040000721 = 476520^2 + 63561^2 .

It is not a de Polignac number, because 231111311121 - 2³ = 231111311113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231111311094 and 231111311103.

It is not an unprimeable number, because it can be changed into a prime (231111311141) 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 5 ways as a sum of consecutive naturals, for example, 12839517276 + ... + 12839517293.

It is an arithmetic number, because the mean of its divisors is an integer number (55637908235).

Almost surely, 2^231111311121 is an apocalyptic number.

It is an amenable number.

231111311121 is a deficient number, since it is larger than the sum of its proper divisors (102716138289).

231111311121 is a wasteful number, since it uses less digits than its factorization.

231111311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25679034575 (or 25679034572 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 231111311121 its reverse (121113111132), we get a palindrome (352224422253).

The spelling of 231111311121 in words is "two hundred thirty-one billion, one hundred eleven million, three hundred eleven thousand, one hundred twenty-one".