281840113 has 2 divisors, whose sum is σ = 281840114. Its totient is φ = 281840112.

The previous prime is 281840087. The next prime is 281840131. The reversal of 281840113 is 311048182.

Together with next prime (281840131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167521249 + 114318864 = 12943^2 + 10692^2 .

It is a cyclic number.

It is not a de Polignac number, because 281840113 - 2⁹ = 281839601 is a prime.

It is not a weakly prime, because it can be changed into another prime (281840213) 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, 140920056 + 140920057.

It is an arithmetic number, because the mean of its divisors is an integer number (140920057).

Almost surely, 2^281840113 is an apocalyptic number.

It is an amenable number.

281840113 is a deficient number, since it is larger than the sum of its proper divisors (1).

281840113 is an equidigital number, since it uses as much as digits as its factorization.

281840113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 281840113 is about 16788.0943826272. The cubic root of 281840113 is about 655.6432606086.

Adding to 281840113 its reverse (311048182), we get a palindrome (592888295).

The spelling of 281840113 in words is "two hundred eighty-one million, eight hundred forty thousand, one hundred thirteen".