228581 has 2 divisors, whose sum is σ = 228582.
Its totient is φ = 228580.
The previous prime is 228577. The next prime is 228587. The reversal of 228581 is 185822.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 184900 + 43681 = 430^2 + 209^2
It is a cyclic number.
It is not a de Polignac number, because 228581 - 22 = 228577 is a prime.
It is a super-2 number, since 2×2285812 = 104498547122, which contains 22 as substring.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 228581.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (228587) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114290 + 114291.
It is an arithmetic number, because the mean of its divisors is an integer number (114291).
2228581 is an apocalyptic number.
It is an amenable number.
228581 is a deficient number, since it is larger than the sum of its proper divisors (1).
228581 is an equidigital number, since it uses as much as digits as its factorization.
228581 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1280, while the sum is 26.
The square root of 228581 is about 478.1014536686.
The cubic root of 228581 is about 61.1429951771.
The spelling of 228581 in words is "two hundred twenty-eight thousand, five hundred eighty-one".