18116687 has 2 divisors, whose sum is σ = 18116688. Its totient is φ = 18116686.

The previous prime is 18116669. The next prime is 18116719. The reversal of 18116687 is 78661181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18116687 - 2¹⁶ = 18051151 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18116687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18116587) 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 as a sum of consecutive naturals, namely, 9058343 + 9058344.

It is an arithmetic number, because the mean of its divisors is an integer number (9058344).

Almost surely, 2^18116687 is an apocalyptic number.

18116687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18116687 is an equidigital number, since it uses as much as digits as its factorization.

18116687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 38.

The square root of 18116687 is about 4256.3701671730. The cubic root of 18116687 is about 262.6392283331.

The spelling of 18116687 in words is "eighteen million, one hundred sixteen thousand, six hundred eighty-seven".