18149 has 2 divisors, whose sum is σ = 18150. Its totient is φ = 18148.
The previous prime is 18143. The next prime is 18169. The reversal of 18149 is 94181.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 13924 + 4225 = 118^2 + 65^2 .
It is a cyclic number.
It is not a de Polignac number, because 18149 - 24 = 18133 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is an Ulam number.
It is an alternating number because its digits alternate between odd and even.
It is a Curzon number.
It is a plaindrome in base 11 and base 15.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18149.
It is not a weakly prime, because it can be changed into another prime (18143) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9074 + 9075.
It is an arithmetic number, because the mean of its divisors is an integer number (9075).
218149 is an apocalyptic number.
It is an amenable number.
18149 is a deficient number, since it is larger than the sum of its proper divisors (1).
18149 is an equidigital number, since it uses as much as digits as its factorization.
18149 is an evil number, because the sum of its binary digits is even.
The product of its digits is 288, while the sum is 23.
The square root of 18149 is about 134.7182244539. The cubic root of 18149 is about 26.2795283738.
The spelling of 18149 in words is "eighteen thousand, one hundred forty-nine".
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