281123 has 4 divisors (see below), whose sum is σ = 285048. Its totient is φ = 277200.

The previous prime is 281117. The next prime is 281131. The reversal of 281123 is 321182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321182 = 2 ⋅160591.

It is a cyclic number.

It is not a de Polignac number, because 281123 - 2¹⁰ = 280099 is a prime.

It is a super-2 number, since 2×281123² = 158060282258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281153) 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 3 ways as a sum of consecutive naturals, for example, 1853 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (71262).

2²⁸¹¹²³ is an apocalyptic number.

281123 is a deficient number, since it is larger than the sum of its proper divisors (3925).

281123 is an equidigital number, since it uses as much as digits as its factorization.

281123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924.

The product of its digits is 96, while the sum is 17.

The square root of 281123 is about 530.2103356216. The cubic root of 281123 is about 65.5086716177.

It can be divided in two parts, 281 and 123, that added together give a palindrome (404).

The spelling of 281123 in words is "two hundred eighty-one thousand, one hundred twenty-three".