231311121 has 8 divisors (see below), whose sum is σ = 309112800. Its totient is φ = 153858432.

The previous prime is 231311107. The next prime is 231311153. The reversal of 231311121 is 121113132.

It is a happy number.

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

It is not a de Polignac number, because 231311121 - 2¹⁸ = 231048977 is a prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 231311121.

It is not an unprimeable number, because it can be changed into a prime (231311021) 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 7 ways as a sum of consecutive naturals, for example, 85696 + ... + 88353.

It is an arithmetic number, because the mean of its divisors is an integer number (38639100).

Almost surely, 2^231311121 is an apocalyptic number.

It is an amenable number.

231311121 is a deficient number, since it is larger than the sum of its proper divisors (77801679).

231311121 is a wasteful number, since it uses less digits than its factorization.

231311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174495.

The product of its digits is 36, while the sum is 15.

The square root of 231311121 is about 15208.9158390728. The cubic root of 231311121 is about 613.8545855954.

Adding to 231311121 its reverse (121113132), we get a palindrome (352424253).

It can be divided in two parts, 2313111 and 21, that added together give a palindrome (2313132).

The spelling of 231311121 in words is "two hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".