231320833 has 2 divisors, whose sum is σ = 231320834. Its totient is φ = 231320832.

The previous prime is 231320827. The next prime is 231320857. The reversal of 231320833 is 338023132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225210049 + 6110784 = 15007^2 + 2472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231320833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231320798 and 231320807.

It is not a weakly prime, because it can be changed into another prime (231320333) 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, 115660416 + 115660417.

It is an arithmetic number, because the mean of its divisors is an integer number (115660417).

Almost surely, 2^231320833 is an apocalyptic number.

It is an amenable number.

231320833 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320833 is an equidigital number, since it uses as much as digits as its factorization.

231320833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 231320833 is about 15209.2351221223. The cubic root of 231320833 is about 613.8631767262.

Adding to 231320833 its reverse (338023132), we get a palindrome (569343965).

The spelling of 231320833 in words is "two hundred thirty-one million, three hundred twenty thousand, eight hundred thirty-three".