18041 has 2 divisors, whose sum is σ = 18042.
Its totient is φ = 18040.
The previous prime is 18013. The next prime is 18043. The reversal of 18041 is 14081.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 10816 + 7225 = 104^2 + 85^2
It is an emirp because it is prime and its reverse (14081) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18041 - 26 = 17977 is a prime.
It is a Sophie Germain prime.
Together with 18043, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is equal to p2066 and since 18041 and 2066 have the same sum of digits, it is a Honaker prime.
It is a plaindrome in base 16.
It is not a weakly prime, because it can be changed into another prime (18043) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020 + 9021.
It is an arithmetic number, because the mean of its divisors is an integer number (9021).
218041 is an apocalyptic number.
It is an amenable number.
18041 is a deficient number, since it is larger than the sum of its proper divisors (1).
18041 is an equidigital number, since it uses as much as digits as its factorization.
18041 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 32, while the sum is 14.
The square root of 18041 is about 134.3167897174.
The cubic root of 18041 is about 26.2272970750.
The spelling of 18041 in words is "eighteen thousand, forty-one".