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BaseRepresentation
bin100011011111001
3220220221
410123321
51040134
6220041
7103654
oct43371
926827
1018169
1112718
12a621
138368
14689b
1555b4
hex46f9

18169 has 2 divisors, whose sum is σ = 18170. Its totient is φ = 18168.

The previous prime is 18149. The next prime is 18181. The reversal of 18169 is 96181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12544 + 5625 = 112^2 + 75^2 .

It is an emirp because it is prime and its reverse (96181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18169 - 27 = 18041 is a prime.

It is a super-2 number, since 2×181692 = 660225122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

18169 is a lucky number.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (18119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084 + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (9085).

218169 is an apocalyptic number.

It is an amenable number.

18169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18169 is an equidigital number, since it uses as much as digits as its factorization.

18169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 25.

The square root of 18169 is about 134.7924330220. The cubic root of 18169 is about 26.2891780812.

The spelling of 18169 in words is "eighteen thousand, one hundred sixty-nine".