18031159 has 4 divisors (see below), whose sum is σ = 18049680. Its totient is φ = 18012640.

The previous prime is 18031151. The next prime is 18031163. The reversal of 18031159 is 95113081.

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 18031159 - 2³ = 18031151 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 (18031151) 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, 7714 + ... + 9775.

It is an arithmetic number, because the mean of its divisors is an integer number (4512420).

Almost surely, 2^18031159 is an apocalyptic number.

18031159 is a deficient number, since it is larger than the sum of its proper divisors (18521).

18031159 is a wasteful number, since it uses less digits than its factorization.

18031159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18520.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18031159 is about 4246.3112226967. The cubic root of 18031159 is about 262.2252738787.

The spelling of 18031159 in words is "eighteen million, thirty-one thousand, one hundred fifty-nine".