18122851 has 2 divisors, whose sum is σ = 18122852. Its totient is φ = 18122850.

The previous prime is 18122843. The next prime is 18122887. The reversal of 18122851 is 15822181.

It is a weak prime.

It is an emirp because it is prime and its reverse (15822181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18122851 - 2³ = 18122843 is a prime.

It is not a weakly prime, because it can be changed into another prime (18122891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061425 + 9061426.

It is an arithmetic number, because the mean of its divisors is an integer number (9061426).

Almost surely, 2^18122851 is an apocalyptic number.

18122851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122851 is an equidigital number, since it uses as much as digits as its factorization.

18122851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280, while the sum is 28.

The square root of 18122851 is about 4257.0941967497. The cubic root of 18122851 is about 262.6690116416.

It can be divided in two parts, 181 and 22851, that added together give a palindrome (23032).

The spelling of 18122851 in words is "eighteen million, one hundred twenty-two thousand, eight hundred fifty-one".