18116729 has 2 divisors, whose sum is σ = 18116730. Its totient is φ = 18116728.

The previous prime is 18116723. The next prime is 18116731. The reversal of 18116729 is 92761181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 139129 = 4240^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 18116729 - 2⁸ = 18116473 is a prime.

It is a Sophie Germain prime.

Together with 18116731, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18116723) 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, 9058364 + 9058365.

It is an arithmetic number, because the mean of its divisors is an integer number (9058365).

Almost surely, 2^18116729 is an apocalyptic number.

It is an amenable number.

18116729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18116729 is an equidigital number, since it uses as much as digits as its factorization.

18116729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 18116729 is about 4256.3751009515. The cubic root of 18116729 is about 262.6394312922.

The spelling of 18116729 in words is "eighteen million, one hundred sixteen thousand, seven hundred twenty-nine".