231301321 has 2 divisors, whose sum is σ = 231301322. Its totient is φ = 231301320.

The previous prime is 231301313. The next prime is 231301333. The reversal of 231301321 is 123103132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122412096 + 108889225 = 11064^2 + 10435^2 .

It is a cyclic number.

It is not a de Polignac number, because 231301321 - 2³ = 231301313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231301295 and 231301304.

It is not a weakly prime, because it can be changed into another prime (231301391) 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 as a sum of consecutive naturals, namely, 115650660 + 115650661.

It is an arithmetic number, because the mean of its divisors is an integer number (115650661).

Almost surely, 2^231301321 is an apocalyptic number.

It is an amenable number.

231301321 is a deficient number, since it is larger than the sum of its proper divisors (1).

231301321 is an equidigital number, since it uses as much as digits as its factorization.

231301321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231301321 is about 15208.5936562195. The cubic root of 231301321 is about 613.8459163769.

Adding to 231301321 its reverse (123103132), we get a palindrome (354404453).

The spelling of 231301321 in words is "two hundred thirty-one million, three hundred one thousand, three hundred twenty-one".