18236149 has 2 divisors, whose sum is σ = 18236150. Its totient is φ = 18236148.

The previous prime is 18236147. The next prime is 18236159. The reversal of 18236149 is 94163281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 3249 = 4270^2 + 57^2 .

It is a cyclic number.

It is not a de Polignac number, because 18236149 - 2¹ = 18236147 is a prime.

Together with 18236147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18236147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9118074 + 9118075.

It is an arithmetic number, because the mean of its divisors is an integer number (9118075).

Almost surely, 2^18236149 is an apocalyptic number.

It is an amenable number.

18236149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18236149 is an equidigital number, since it uses as much as digits as its factorization.

18236149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 18236149 is about 4270.3804280181. The cubic root of 18236149 is about 263.2152478440.

The spelling of 18236149 in words is "eighteen million, two hundred thirty-six thousand, one hundred forty-nine".