231331121 has 8 divisors (see below), whose sum is σ = 279930240. Its totient is φ = 186619968.

The previous prime is 231331117. The next prime is 231331147. The reversal of 231331121 is 121133132.

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

It is a cyclic number.

It is not a de Polignac number, because 231331121 - 2² = 231331117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231331121.

It is not an unprimeable number, because it can be changed into a prime (231331181) 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, 971861 + ... + 972098.

It is an arithmetic number, because the mean of its divisors is an integer number (34991280).

Almost surely, 2^231331121 is an apocalyptic number.

It is an amenable number.

231331121 is a deficient number, since it is larger than the sum of its proper divisors (48599119).

231331121 is a wasteful number, since it uses less digits than its factorization.

231331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943983.

The product of its digits is 108, while the sum is 17.

The square root of 231331121 is about 15209.5733339236. The cubic root of 231331121 is about 613.8722771181.

Adding to 231331121 its reverse (121133132), we get a palindrome (352464253).

The spelling of 231331121 in words is "two hundred thirty-one million, three hundred thirty-one thousand, one hundred twenty-one".