123231121 has 8 divisors (see below), whose sum is σ = 137287080. Its totient is φ = 109828992.

The previous prime is 123231109. The next prime is 123231161. The reversal of 123231121 is 121132321.

It can be written as a sum of positive squares in 4 ways, for example, as 11696400 + 111534721 = 3420^2 + 10561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123231121 - 2⁷ = 123230993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123231095 and 123231104.

It is not an unprimeable number, because it can be changed into a prime (123231161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163060 + ... + 163813.

It is an arithmetic number, because the mean of its divisors is an integer number (17160885).

Almost surely, 2^123231121 is an apocalyptic number.

It is an amenable number.

123231121 is a deficient number, since it is larger than the sum of its proper divisors (14055959).

123231121 is a wasteful number, since it uses less digits than its factorization.

123231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326915.

The product of its digits is 72, while the sum is 16.

The square root of 123231121 is about 11100.9513556271. The cubic root of 123231121 is about 497.6302812761.

Adding to 123231121 its reverse (121132321), we get a palindrome (244363442).

The spelling of 123231121 in words is "one hundred twenty-three million, two hundred thirty-one thousand, one hundred twenty-one".