18516851 has 2 divisors, whose sum is σ = 18516852. Its totient is φ = 18516850.

The previous prime is 18516833. The next prime is 18516881. The reversal of 18516851 is 15861581.

It is a weak prime.

It is an emirp because it is prime and its reverse (15861581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18516851 - 2¹⁸ = 18254707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18516821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9258425 + 9258426.

It is an arithmetic number, because the mean of its divisors is an integer number (9258426).

Almost surely, 2^18516851 is an apocalyptic number.

18516851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18516851 is an equidigital number, since it uses as much as digits as its factorization.

18516851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 35.

The square root of 18516851 is about 4303.1210766140. The cubic root of 18516851 is about 264.5589006944.

The spelling of 18516851 in words is "eighteen million, five hundred sixteen thousand, eight hundred fifty-one".