230713781 has 2 divisors, whose sum is σ = 230713782. Its totient is φ = 230713780.

The previous prime is 230713757. The next prime is 230713829. The reversal of 230713781 is 187317032.

230713781 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., 152744881 + 77968900 = 12359^2 + 8830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230713781 is a prime.

It is a super-2 number, since 2×230713781² = 106457697486631922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_12679700 and since 230713781 and 12679700 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230713381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115356890 + 115356891.

It is an arithmetic number, because the mean of its divisors is an integer number (115356891).

Almost surely, 2^230713781 is an apocalyptic number.

It is an amenable number.

230713781 is a deficient number, since it is larger than the sum of its proper divisors (1).

230713781 is an equidigital number, since it uses as much as digits as its factorization.

230713781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 230713781 is about 15189.2653212721. The cubic root of 230713781 is about 613.3257221475.

The spelling of 230713781 in words is "two hundred thirty million, seven hundred thirteen thousand, seven hundred eighty-one".