18936149 has 2 divisors, whose sum is σ = 18936150. Its totient is φ = 18936148.

The previous prime is 18936139. The next prime is 18936157. The reversal of 18936149 is 94163981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 600625 = 4282^2 + 775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18936149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18936139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468074 + 9468075.

It is an arithmetic number, because the mean of its divisors is an integer number (9468075).

Almost surely, 2^18936149 is an apocalyptic number.

It is an amenable number.

18936149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18936149 is an equidigital number, since it uses as much as digits as its factorization.

18936149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 18936149 is about 4351.5685677696. The cubic root of 18936149 is about 266.5409169259.

The spelling of 18936149 in words is "eighteen million, nine hundred thirty-six thousand, one hundred forty-nine".