231005321 has 2 divisors, whose sum is σ = 231005322. Its totient is φ = 231005320.

The previous prime is 231005311. The next prime is 231005339. The reversal of 231005321 is 123500132.

231005321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141967225 + 89038096 = 11915^2 + 9436^2 .

It is a cyclic number.

It is not a de Polignac number, because 231005321 - 2²² = 226811017 is a prime.

It is a Sophie Germain prime.

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 231005321.

It is not a weakly prime, because it can be changed into another prime (231005311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115502660 + 115502661.

It is an arithmetic number, because the mean of its divisors is an integer number (115502661).

Almost surely, 2^231005321 is an apocalyptic number.

It is an amenable number.

231005321 is a deficient number, since it is larger than the sum of its proper divisors (1).

231005321 is an equidigital number, since it uses as much as digits as its factorization.

231005321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 231005321 is about 15198.8592006111. The cubic root of 231005321 is about 613.5839551207.

Adding to 231005321 its reverse (123500132), we get a palindrome (354505453).

The spelling of 231005321 in words is "two hundred thirty-one million, five thousand, three hundred twenty-one".