18071149 has 2 divisors, whose sum is σ = 18071150. Its totient is φ = 18071148.

The previous prime is 18071143. The next prime is 18071159. The reversal of 18071149 is 94117081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 8649 = 4250^2 + 93^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18071149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18071149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18071143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035574 + 9035575.

It is an arithmetic number, because the mean of its divisors is an integer number (9035575).

Almost surely, 2^18071149 is an apocalyptic number.

It is an amenable number.

18071149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18071149 is an equidigital number, since it uses as much as digits as its factorization.

18071149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 18071149 is about 4251.0174076331. The cubic root of 18071149 is about 262.4189875478.

The spelling of 18071149 in words is "eighteen million, seventy-one thousand, one hundred forty-nine".