281888113 has 18 divisors (see below), whose sum is σ = 310467186. Its totient is φ = 255820032.

The previous prime is 281888107. The next prime is 281888141. The reversal of 281888113 is 311888182.

It can be written as a sum of positive squares in 9 ways, for example, as 216472369 + 65415744 = 14713^2 + 8088^2 .

It is not a de Polignac number, because 281888113 - 2¹⁷ = 281757041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281888143) 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 in 17 ways as a sum of consecutive naturals, for example, 900445 + ... + 900757.

It is an arithmetic number, because the mean of its divisors is an integer number (17248177).

Almost surely, 2^281888113 is an apocalyptic number.

It is an amenable number.

281888113 is a deficient number, since it is larger than the sum of its proper divisors (28579073).

281888113 is an equidigital number, since it uses as much as digits as its factorization.

281888113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 399 counting only the distinct ones).

The product of its digits is 24576, while the sum is 40.

The square root of 281888113 is about 16789.5239062935. The cubic root of 281888113 is about 655.6804792167.

The spelling of 281888113 in words is "two hundred eighty-one million, eight hundred eighty-eight thousand, one hundred thirteen".