230691281 has 2 divisors, whose sum is σ = 230691282. Its totient is φ = 230691280.

The previous prime is 230691271. The next prime is 230691299. The reversal of 230691281 is 182196032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159794881 + 70896400 = 12641^2 + 8420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230691281 is a prime.

It is a super-2 number, since 2×230691281² = 106436934258841922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (230691221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115345640 + 115345641.

It is an arithmetic number, because the mean of its divisors is an integer number (115345641).

Almost surely, 2^230691281 is an apocalyptic number.

It is an amenable number.

230691281 is a deficient number, since it is larger than the sum of its proper divisors (1).

230691281 is an equidigital number, since it uses as much as digits as its factorization.

230691281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 230691281 is about 15188.5246485628. The cubic root of 230691281 is about 613.3057836226.

The spelling of 230691281 in words is "two hundred thirty million, six hundred ninety-one thousand, two hundred eighty-one".