281005 has 8 divisors (see below), whose sum is σ = 345312. Its totient is φ = 219408.

The previous prime is 280997. The next prime is 281023. The reversal of 281005 is 500182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281005 - 2³ = 280997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 281005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439 + ... + 868.

It is an arithmetic number, because the mean of its divisors is an integer number (43164).

2²⁸¹⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

281005 is a deficient number, since it is larger than the sum of its proper divisors (64307).

281005 is a wasteful number, since it uses less digits than its factorization.

281005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 281005 is about 530.0990473487. The cubic root of 281005 is about 65.4995046871.

Adding to 281005 its reverse (500182), we get a palindrome (781187).

The spelling of 281005 in words is "two hundred eighty-one thousand, five".