18049159 has 4 divisors (see below), whose sum is σ = 18121320. Its totient is φ = 17977000.

The previous prime is 18049147. The next prime is 18049169. The reversal of 18049159 is 95194081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18049159 - 2⁵ = 18049127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049169) 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 in 3 ways as a sum of consecutive naturals, for example, 35704 + ... + 36205.

It is an arithmetic number, because the mean of its divisors is an integer number (4530330).

Almost surely, 2^18049159 is an apocalyptic number.

18049159 is a deficient number, since it is larger than the sum of its proper divisors (72161).

18049159 is an equidigital number, since it uses as much as digits as its factorization.

18049159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72160.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 18049159 is about 4248.4301806667. The cubic root of 18049159 is about 262.3125022365.

The spelling of 18049159 in words is "eighteen million, forty-nine thousand, one hundred fifty-nine".