5531 has 2 divisors, whose sum is σ = 5532.
Its totient is φ = 5530.
The previous prime is 5527. The next prime is 5557. The reversal of 5531 is 1355.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 5531 - 22 = 5527 is a prime.
It is a super-2 number, since 2×55312 = 61183922, which contains 22 as substring.
It is a Chen prime.
It is an Ulam number.
It is a plaindrome in base 16.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (5501) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765 + 2766.
It is an arithmetic number, because the mean of its divisors is an integer number (2766).
25531 is an apocalyptic number.
5531 is a deficient number, since it is larger than the sum of its proper divisors (1).
5531 is an equidigital number, since it uses as much as digits as its factorization.
5531 is an evil number, because the sum of its binary digits is even.
The product of its digits is 75, while the sum is 14.
The square root of 5531 is about 74.3706931526.
The cubic root of 5531 is about 17.6848434414.
Adding to 5531 its reverse (1355), we get a palindrome (6886).
The spelling of 5531 in words is "five thousand, five hundred thirty-one".