11481 has 8 divisors (see below), whose sum is σ = 15840. Its totient is φ = 7392.

The previous prime is 11471. The next prime is 11483. The reversal of 11481 is 18411.

11481 is an esthetic number in base 12, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 11481 - 2⁷ = 11353 is a prime.

It is a super-2 number, since 2×11481² = 263626722, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 9 and base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 11481.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 11481.

It is not an unprimeable number, because it can be changed into a prime (11483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85 + ... + 173.

It is an arithmetic number, because the mean of its divisors is an integer number (1980).

2¹¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

11481 is a deficient number, since it is larger than the sum of its proper divisors (4359).

11481 is an equidigital number, since it uses as much as digits as its factorization.

11481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135.

The product of its digits is 32, while the sum is 15.

The square root of 11481 is about 107.1494283699. The cubic root of 11481 is about 22.5593494858.

Subtracting from 11481 its product of digits (32), we obtain a square (11449 = 107²).

Adding to 11481 its reverse (18411), we get a palindrome (29892).

The spelling of 11481 in words is "eleven thousand, four hundred eighty-one".