50581 has 2 divisors, whose sum is σ = 50582.
Its totient is φ = 50580.
The previous prime is 50551. The next prime is 50587. The reversal of 50581 is 18505.
50581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 46225 + 4356 = 215^2 + 66^2
It is a cyclic number.
It is not a de Polignac number, because 50581 - 25 = 50549 is a prime.
It is a super-2 number, since 2×505812 = 5116875122, which contains 22 as substring.
It is an alternating number because its digits alternate between odd and even.
It is a nialpdrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (50587) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25290 + 25291.
It is an arithmetic number, because the mean of its divisors is an integer number (25291).
250581 is an apocalyptic number.
It is an amenable number.
50581 is a deficient number, since it is larger than the sum of its proper divisors (1).
50581 is an equidigital number, since it uses as much as digits as its factorization.
50581 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 200, while the sum is 19.
The square root of 50581 is about 224.9022009674.
The cubic root of 50581 is about 36.9824606425.
The spelling of 50581 in words is "fifty thousand, five hundred eighty-one".