3281 has 4 divisors (see below), whose sum is σ = 3492. Its totient is φ = 3072.

The previous prime is 3271. The next prime is 3299. The reversal of 3281 is 1823.

3281 = 5² + 6² + ... + 21².

3281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1681 + 1600 = 41^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 3281 - 2⁶ = 3217 is a prime.

It is a super-2 number, since 2×3281² = 21529922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 3 and base 9.

It is a nialpdrome in base 8.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3281.

It is not an unprimeable number, because it can be changed into a prime (3221) 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, 80 + ... + 113.

It is an arithmetic number, because the mean of its divisors is an integer number (873).

3281 is a Friedman number, since it can be written as (3^8+1)/2, using all its digits and the basic arithmetic operations.

2³²⁸¹ is an apocalyptic number.

3281 is the 41-st centered square number.

It is an amenable number.

3281 is a deficient number, since it is larger than the sum of its proper divisors (211).

3281 is a wasteful number, since it uses less digits than its factorization.

3281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210.

The product of its digits is 48, while the sum is 14.

The square root of 3281 is about 57.2800139665. The cubic root of 3281 is about 14.8594274805.

The spelling of 3281 in words is "three thousand, two hundred eighty-one".