281287 has 4 divisors (see below), whose sum is σ = 284760. Its totient is φ = 277816.

The previous prime is 281279. The next prime is 281291. The reversal of 281287 is 782182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281287 - 2³ = 281279 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 (281207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1612 + ... + 1777.

It is an arithmetic number, because the mean of its divisors is an integer number (71190).

2²⁸¹²⁸⁷ is an apocalyptic number.

281287 is a deficient number, since it is larger than the sum of its proper divisors (3473).

281287 is an equidigital number, since it uses as much as digits as its factorization.

281287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472.

The product of its digits is 1792, while the sum is 28.

The square root of 281287 is about 530.3649686772. The cubic root of 281287 is about 65.5214078383.

The spelling of 281287 in words is "two hundred eighty-one thousand, two hundred eighty-seven".