16481 has 2 divisors, whose sum is σ = 16482. Its totient is φ = 16480.

The previous prime is 16477. The next prime is 16487. The reversal of 16481 is 18461.

16481 is nontrivially palindromic in base 9.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13456 + 3025 = 116^2 + 55^2 .

It is an emirp because it is prime and its reverse (18461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16481 - 2² = 16477 is a prime.

It is a super-2 number, since 2×16481² = 543246722, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 16481.

It is not a weakly prime, because it can be changed into another prime (16487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8240 + 8241.

It is an arithmetic number, because the mean of its divisors is an integer number (8241).

2¹⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

16481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16481 is an equidigital number, since it uses as much as digits as its factorization.

16481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 16481 is about 128.3783470839. The cubic root of 16481 is about 25.4484412543.

Subtracting from 16481 its sum of digits (20), we obtain a palindrome (16461).

The spelling of 16481 in words is "sixteen thousand, four hundred eighty-one".