18131159 has 2 divisors, whose sum is σ = 18131160. Its totient is φ = 18131158.

The previous prime is 18131137. The next prime is 18131161. The reversal of 18131159 is 95113181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18131159 is a prime.

It is a Sophie Germain prime.

Together with 18131161, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18131359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9065579 + 9065580.

It is an arithmetic number, because the mean of its divisors is an integer number (9065580).

Almost surely, 2^18131159 is an apocalyptic number.

18131159 is a deficient number, since it is larger than the sum of its proper divisors (1).

18131159 is an equidigital number, since it uses as much as digits as its factorization.

18131159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 29.

The square root of 18131159 is about 4258.0698679096. The cubic root of 18131159 is about 262.7091436783.

The spelling of 18131159 in words is "eighteen million, one hundred thirty-one thousand, one hundred fifty-nine".