231233121 has 48 divisors (see below), whose sum is σ = 390833664. Its totient is φ = 129019392.

The previous prime is 231233089. The next prime is 231233129. The reversal of 231233121 is 121332132.

231233121 is a `hidden beast` number, since 2 + 312 + 331 + 21 = 666.

It is not a de Polignac number, because 231233121 - 2⁵ = 231233089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231233094 and 231233103.

It is not an unprimeable number, because it can be changed into a prime (231233129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 629880 + ... + 630246.

It is an arithmetic number, because the mean of its divisors is an integer number (8142368).

Almost surely, 2^231233121 is an apocalyptic number.

231233121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231233121 is a deficient number, since it is larger than the sum of its proper divisors (159600543).

231233121 is a wasteful number, since it uses less digits than its factorization.

231233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 587 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231233121 is about 15206.3513375168. The cubic root of 231233121 is about 613.7855789109.

Adding to 231233121 its reverse (121332132), we get a palindrome (352565253).

It can be divided in two parts, 23123 and 3121, that added together give a square (26244 = 162²).

The spelling of 231233121 in words is "two hundred thirty-one million, two hundred thirty-three thousand, one hundred twenty-one".