18133 has 2 divisors, whose sum is σ = 18134. Its totient is φ = 18132.
The previous prime is 18131. The next prime is 18143. The reversal of 18133 is 33181.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 14884 + 3249 = 122^2 + 57^2 .
It is an emirp because it is prime and its reverse (33181) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18133 - 21 = 18131 is a prime.
Together with 18131, it forms a pair of twin primes.
It is a plaindrome in base 9 and base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18131) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9066 + 9067.
It is an arithmetic number, because the mean of its divisors is an integer number (9067).
218133 is an apocalyptic number.
It is an amenable number.
18133 is a deficient number, since it is larger than the sum of its proper divisors (1).
18133 is an equidigital number, since it uses as much as digits as its factorization.
18133 is an evil number, because the sum of its binary digits is even.
The product of its digits is 72, while the sum is 16.
The square root of 18133 is about 134.6588281547. The cubic root of 18133 is about 26.2718035023.
It can be divided in two parts, 18 and 133, that added together give a palindrome (151).
The spelling of 18133 in words is "eighteen thousand, one hundred thirty-three".
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