5521 has 2 divisors, whose sum is σ = 5522.
Its totient is φ = 5520.
The previous prime is 5519. The next prime is 5527. The reversal of 5521 is 1255.
5521 is nontrivially palindromic in base 8.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 4225 + 1296 = 65^2 + 36^2
It is a cyclic number.
It is not a de Polignac number, because 5521 - 21 = 5519 is a prime.
Together with 5519, it forms a pair of twin primes.
It is a plaindrome in base 13.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (5527) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2760 + 2761.
It is an arithmetic number, because the mean of its divisors is an integer number (2761).
25521 is an apocalyptic number.
It is an amenable number.
5521 is a deficient number, since it is larger than the sum of its proper divisors (1).
5521 is an equidigital number, since it uses as much as digits as its factorization.
5521 is an evil number, because the sum of its binary digits is even.
The product of its digits is 50, while the sum is 13.
The square root of 5521 is about 74.3034319530.
The cubic root of 5521 is about 17.6741789973.
Adding to 5521 its reverse (1255), we get a palindrome (6776).
The spelling of 5521 in words is "five thousand, five hundred twenty-one".