5081 has 2 divisors, whose sum is σ = 5082.
Its totient is φ = 5080.
The previous prime is 5077. The next prime is 5087. The reversal of 5081 is 1805.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 3481 + 1600 = 59^2 + 40^2
It is a cyclic number.
It is not a de Polignac number, because 5081 - 22 = 5077 is a prime.
It is a super-2 number, since 2×50812 = 51633122, which contains 22 as substring.
It is a Sophie Germain prime.
It is an Ulam number.
It is a Curzon number.
It is a plaindrome in base 11, base 14 and base 15.
It is not a weakly prime, because it can be changed into another prime (5087) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540 + 2541.
It is an arithmetic number, because the mean of its divisors is an integer number (2541).
25081 is an apocalyptic number.
It is an amenable number.
5081 is a deficient number, since it is larger than the sum of its proper divisors (1).
5081 is an equidigital number, since it uses as much as digits as its factorization.
5081 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 40, while the sum is 14.
The square root of 5081 is about 71.2811335488.
The cubic root of 5081 is about 17.1916039787.
Subtracting from 5081 its product of nonzero digits (40), we obtain a square (5041 = 712).
Adding to 5081 its reverse (1805), we get a palindrome (6886).
It can be divided in two parts, 50 and 81, that added together give a palindrome (131).
The spelling of 5081 in words is "five thousand, eighty-one".