16281 has 12 divisors (see below), whose sum is σ = 24752.
Its totient is φ = 10692.
The previous prime is 16273. The next prime is 16301. The reversal of 16281 is 18261.
It can be divided in two parts, 162 and 81, that added together give a 5-th power (243 = 35).
It is not a de Polignac number, because 16281 - 23 = 16273 is a prime.
It is a super-2 number, since 2×162812 = 530141922, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a nialpdrome in base 3.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 16281.
It is not an unprimeable number, because it can be changed into a prime (16231) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210 + ... + 276.
216281 is an apocalyptic number.
16281 is the 81-st heptagonal number.
It is an amenable number.
16281 is a deficient number, since it is larger than the sum of its proper divisors (8471).
16281 is an frugal number, since it uses more digits than its factorization.
16281 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 82 (or 70 counting only the distinct ones).
The product of its digits is 96, while the sum is 18.
The square root of 16281 is about 127.5970219088.
The cubic root of 16281 is about 25.3450815009.
The spelling of 16281 in words is "sixteen thousand, two hundred eighty-one".