231321231 has 8 divisors (see below), whose sum is σ = 342698160. Its totient is φ = 154214136.

The previous prime is 231321191. The next prime is 231321301. The reversal of 231321231 is 132123132.

It is not a de Polignac number, because 231321231 - 2¹¹ = 231319183 is a prime.

It is a super-2 number, since 2×231321231² = 107019023822710722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4283700 + ... + 4283753.

It is an arithmetic number, because the mean of its divisors is an integer number (42837270).

Almost surely, 2^231321231 is an apocalyptic number.

231321231 is a deficient number, since it is larger than the sum of its proper divisors (111376929).

231321231 is an equidigital number, since it uses as much as digits as its factorization.

231321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8567462 (or 8567456 counting only the distinct ones).

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

The square root of 231321231 is about 15209.2482062724. The cubic root of 231321231 is about 613.8635287876.

Adding to 231321231 its reverse (132123132), we get a palindrome (363444363).

The spelling of 231321231 in words is "two hundred thirty-one million, three hundred twenty-one thousand, two hundred thirty-one".