281023985 has 16 divisors (see below), whose sum is σ = 368597952. Its totient is φ = 203985600.

The previous prime is 281023969. The next prime is 281023999. The reversal of 281023985 is 589320182.

It is not a de Polignac number, because 281023985 - 2⁴ = 281023969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 25415 + ... + 34755.

It is an arithmetic number, because the mean of its divisors is an integer number (23037372).

Almost surely, 2^281023985 is an apocalyptic number.

It is an amenable number.

281023985 is a deficient number, since it is larger than the sum of its proper divisors (87573967).

281023985 is a wasteful number, since it uses less digits than its factorization.

281023985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 281023985 is about 16763.7700115457. The cubic root of 281023985 is about 655.0097972623.

The spelling of 281023985 in words is "two hundred eighty-one million, twenty-three thousand, nine hundred eighty-five".