5981 has 2 divisors, whose sum is σ = 5982.
Its totient is φ = 5980.
The previous prime is 5953. The next prime is 5987. The reversal of 5981 is 1895.
5981 is nontrivially palindromic in base 2.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 3481 + 2500 = 59^2 + 50^2
It is a cyclic number.
It is not a de Polignac number, because 5981 - 210 = 4957 is a prime.
It is a super-2 number, since 2×59812 = 71544722, which contains 22 as substring.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (5987) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2990 + 2991.
It is an arithmetic number, because the mean of its divisors is an integer number (2991).
25981 is an apocalyptic number.
It is an amenable number.
5981 is a deficient number, since it is larger than the sum of its proper divisors (1).
5981 is an equidigital number, since it uses as much as digits as its factorization.
5981 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 360, while the sum is 23.
The square root of 5981 is about 77.3369252039.
The cubic root of 5981 is about 18.1520049289.
The spelling of 5981 in words is "five thousand, nine hundred eighty-one".