281969 has 4 divisors (see below), whose sum is σ = 283044. Its totient is φ = 280896.

The previous prime is 281959. The next prime is 281971. The reversal of 281969 is 969182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 112225 + 169744 = 335^2 + 412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281969 is a prime.

It is a super-2 number, since 2×281969² = 159013033922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281959) 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, 149 + ... + 765.

It is an arithmetic number, because the mean of its divisors is an integer number (70761).

2²⁸¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

281969 is a deficient number, since it is larger than the sum of its proper divisors (1075).

281969 is an equidigital number, since it uses as much as digits as its factorization.

281969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074.

The product of its digits is 7776, while the sum is 35.

The square root of 281969 is about 531.0075329033. The cubic root of 281969 is about 65.5743188441.

The spelling of 281969 in words is "two hundred eighty-one thousand, nine hundred sixty-nine".