163281 has 8 divisors (see below), whose sum is σ = 223744. Its totient is φ = 105840.

The previous prime is 163259. The next prime is 163307. The reversal of 163281 is 182361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163281 - 2⁵ = 163249 is a prime.

It is a super-2 number, since 2×163281² = 53321369922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625 + ... + 846.

It is an arithmetic number, because the mean of its divisors is an integer number (27968).

2¹⁶³²⁸¹ is an apocalyptic number.

It is an amenable number.

163281 is a deficient number, since it is larger than the sum of its proper divisors (60463).

163281 is a wasteful number, since it uses less digits than its factorization.

163281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its digits is 288, while the sum is 21.

The square root of 163281 is about 404.0804375369. The cubic root of 163281 is about 54.6569278375.

It can be divided in two parts, 163 and 281, that added together give a palindrome (444).

The spelling of 163281 in words is "one hundred sixty-three thousand, two hundred eighty-one".