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9081 = 321009

9081 has 6 divisors (see below), whose sum is σ = 13130. Its totient is φ = 6048.

The previous prime is 9067. The next prime is 9091. The reversal of 9081 is 1809.

It can be written as a sum of positive squares in only one way, i.e., 7056 + 2025 = 84^2 + 45^2 .

It is not a de Polignac number, because 9081 - 25 = 9049 is a prime.

It is a super-2 number, since 2×90812 = 164929122, which contains 22 as substring.

It is a Duffinian number.

9081 is a modest number, since divided by 81 gives 9 as remainder.

9081 is a lucky number.

It is a plaindrome in base 14 and base 16.

It is not an unprimeable number, because it can be changed into a prime (9001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 496 + ... + 513.

It is an amenable number.

9081 is a deficient number, since it is larger than the sum of its proper divisors (4049).

9081 is a wasteful number, since it uses less digits than its factorization.

9081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 9081 is about 95.2942810456. The cubic root of 9081 is about 20.8630544681.

Subtracting from 9081 its product of nonzero digits (72), we obtain a palindrome (9009).

It can be divided in two parts, 908 and 1, that added together give a palindrome (909).

The spelling of 9081 in words is "nine thousand, eighty-one".

Divisors: 1 3 9 1009 3027 9081