281289 has 4 divisors (see below), whose sum is σ = 375056. Its totient is φ = 187524.

The previous prime is 281279. The next prime is 281291. The reversal of 281289 is 982182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 281289 - 2⁴ = 281273 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (281249) 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, 46879 + ... + 46884.

It is an arithmetic number, because the mean of its divisors is an integer number (93764).

2²⁸¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

281289 is a deficient number, since it is larger than the sum of its proper divisors (93767).

281289 is an equidigital number, since it uses as much as digits as its factorization.

281289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93766.

The product of its digits is 2304, while the sum is 30.

The square root of 281289 is about 530.3668541679. The cubic root of 281289 is about 65.5215631275.

The spelling of 281289 in words is "two hundred eighty-one thousand, two hundred eighty-nine".