230305813 has 2 divisors, whose sum is σ = 230305814. Its totient is φ = 230305812.

The previous prime is 230305799. The next prime is 230305843. The reversal of 230305813 is 318503032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225540324 + 4765489 = 15018^2 + 2183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230305813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230305843) 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, 115152906 + 115152907.

It is an arithmetic number, because the mean of its divisors is an integer number (115152907).

Almost surely, 2^230305813 is an apocalyptic number.

It is an amenable number.

230305813 is a deficient number, since it is larger than the sum of its proper divisors (1).

230305813 is an equidigital number, since it uses as much as digits as its factorization.

230305813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 230305813 is about 15175.8298949349. The cubic root of 230305813 is about 612.9639970446.

Adding to 230305813 its reverse (318503032), we get a palindrome (548808845).

The spelling of 230305813 in words is "two hundred thirty million, three hundred five thousand, eight hundred thirteen".