18019149 has 4 divisors (see below), whose sum is σ = 24025536. Its totient is φ = 12012764.

The previous prime is 18019147. The next prime is 18019159. The reversal of 18019149 is 94191081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18019149 - 2¹ = 18019147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003189 + ... + 3003194.

It is an arithmetic number, because the mean of its divisors is an integer number (6006384).

Almost surely, 2^18019149 is an apocalyptic number.

It is an amenable number.

18019149 is a deficient number, since it is larger than the sum of its proper divisors (6006387).

18019149 is an equidigital number, since it uses as much as digits as its factorization.

18019149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006386.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 18019149 is about 4244.8968185340. The cubic root of 18019149 is about 262.1670408866.

The spelling of 18019149 in words is "eighteen million, nineteen thousand, one hundred forty-nine".