18885149 has 2 divisors, whose sum is σ = 18885150. Its totient is φ = 18885148.

The previous prime is 18885137. The next prime is 18885157. The reversal of 18885149 is 94158881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 822649 = 4250^2 + 907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18885149 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 (18885109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442574 + 9442575.

It is an arithmetic number, because the mean of its divisors is an integer number (9442575).

Almost surely, 2^18885149 is an apocalyptic number.

It is an amenable number.

18885149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885149 is an equidigital number, since it uses as much as digits as its factorization.

18885149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 44.

The square root of 18885149 is about 4345.7046609267. The cubic root of 18885149 is about 266.3014136571.

The spelling of 18885149 in words is "eighteen million, eight hundred eighty-five thousand, one hundred forty-nine".