18061 has 2 divisors, whose sum is σ = 18062. Its totient is φ = 18060.
The previous prime is 18059. The next prime is 18077. The reversal of 18061 is 16081.
It is an a-pointer prime, because the next prime (18077) can be obtained adding 18061 to its sum of digits (16).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 17161 + 900 = 131^2 + 30^2 .
It is a cyclic number.
It is not a de Polignac number, because 18061 - 21 = 18059 is a prime.
Together with 18059, it forms a pair of twin primes.
It is a plaindrome in base 16.
It is a nialpdrome in base 12 and base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18041) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030 + 9031.
It is an arithmetic number, because the mean of its divisors is an integer number (9031).
218061 is an apocalyptic number.
It is an amenable number.
18061 is a deficient number, since it is larger than the sum of its proper divisors (1).
18061 is an equidigital number, since it uses as much as digits as its factorization.
18061 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 48, while the sum is 16.
The square root of 18061 is about 134.3912199513. The cubic root of 18061 is about 26.2369852339.
The spelling of 18061 in words is "eighteen thousand, sixty-one".
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