281281 has 16 divisors (see below), whose sum is σ = 379008. Its totient is φ = 201600.

The previous prime is 281279. The next prime is 281291. The reversal of 281281 is 182182.

281281 = 4² + 5² + ... + 94².

It is not a de Polignac number, because 281281 - 2¹ = 281279 is a prime.

It is a super-2 number, since 2×281281² = 158238001922, which contains 22 as substring.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (281251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (23688).

2²⁸¹²⁸¹ is an apocalyptic number.

It is an amenable number.

281281 is a deficient number, since it is larger than the sum of its proper divisors (97727).

281281 is a wasteful number, since it uses less digits than its factorization.

281281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its digits is 256, while the sum is 22.

The square root of 281281 is about 530.3593121649. The cubic root of 281281 is about 65.5209419663.

Subtracting from 281281 its reverse (182182), we obtain a palindrome (99099).

The spelling of 281281 in words is "two hundred eighty-one thousand, two hundred eighty-one".