231040321 has 8 divisors (see below), whose sum is σ = 240828800. Its totient is φ = 221438448.

The previous prime is 231040309. The next prime is 231040331. The reversal of 231040321 is 123040132.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231040321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231040295 and 231040304.

It is not an unprimeable number, because it can be changed into a prime (231040301) 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, 44121 + ... + 49078.

It is an arithmetic number, because the mean of its divisors is an integer number (30103600).

Almost surely, 2^231040321 is an apocalyptic number.

It is an amenable number.

231040321 is a deficient number, since it is larger than the sum of its proper divisors (9788479).

231040321 is an equidigital number, since it uses as much as digits as its factorization.

231040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93303.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231040321 is about 15200.0105592069. The cubic root of 231040321 is about 613.6149419307.

Adding to 231040321 its reverse (123040132), we get a palindrome (354080453).

It can be divided in two parts, 231040 and 321, that added together give a square (231361 = 481²).

The spelling of 231040321 in words is "two hundred thirty-one million, forty thousand, three hundred twenty-one".