18072149 has 2 divisors, whose sum is σ = 18072150. Its totient is φ = 18072148.

The previous prime is 18072079. The next prime is 18072157. The reversal of 18072149 is 94127081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 1612900 = 4057^2 + 1270^2 .

It is an emirp because it is prime and its reverse (94127081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18072149 - 2¹⁶ = 18006613 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 (18072049) 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, 9036074 + 9036075.

It is an arithmetic number, because the mean of its divisors is an integer number (9036075).

Almost surely, 2^18072149 is an apocalyptic number.

It is an amenable number.

18072149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18072149 is an equidigital number, since it uses as much as digits as its factorization.

18072149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 18072149 is about 4251.1350249081. The cubic root of 18072149 is about 262.4238279364.

The spelling of 18072149 in words is "eighteen million, seventy-two thousand, one hundred forty-nine".