230660821 has 2 divisors, whose sum is σ = 230660822. Its totient is φ = 230660820.

The previous prime is 230660783. The next prime is 230660827. The reversal of 230660821 is 128066032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230614596 + 46225 = 15186^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 230660821 - 2¹⁷ = 230529749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 230660821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230660827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115330410 + 115330411.

It is an arithmetic number, because the mean of its divisors is an integer number (115330411).

Almost surely, 2^230660821 is an apocalyptic number.

It is an amenable number.

230660821 is a deficient number, since it is larger than the sum of its proper divisors (1).

230660821 is an equidigital number, since it uses as much as digits as its factorization.

230660821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 230660821 is about 15187.5218847579. The cubic root of 230660821 is about 613.2787892251.

The spelling of 230660821 in words is "two hundred thirty million, six hundred sixty thousand, eight hundred twenty-one".