7281 has 6 divisors (see below), whose sum is σ = 10530. Its totient is φ = 4848.

The previous prime is 7253. The next prime is 7283. The reversal of 7281 is 1827.

7281 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 7056 + 225 = 84^2 + 15^2 .

It is not a de Polignac number, because 7281 - 2¹⁰ = 6257 is a prime.

It is a super-2 number, since 2×7281² = 106025922, which contains 22 as substring.

7281 is an undulating number in base 8.

7281 is a modest number, since divided by 81 gives 72 as remainder.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (7283) 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 5 ways as a sum of consecutive naturals, for example, 396 + ... + 413.

It is an arithmetic number, because the mean of its divisors is an integer number (1755).

2⁷²⁸¹ is an apocalyptic number.

It is an amenable number.

7281 is a deficient number, since it is larger than the sum of its proper divisors (3249).

7281 is a wasteful number, since it uses less digits than its factorization.

7281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815 (or 812 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 7281 is about 85.3287759200. The cubic root of 7281 is about 19.3819295366.

It can be divided in two parts, 728 and 1, that added together give a 6-th power (729 = 3⁶).

The spelling of 7281 in words is "seven thousand, two hundred eighty-one".