18051851 has 2 divisors, whose sum is σ = 18051852. Its totient is φ = 18051850.

The previous prime is 18051823. The next prime is 18051857. The reversal of 18051851 is 15815081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18051851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18051857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9025925 + 9025926.

It is an arithmetic number, because the mean of its divisors is an integer number (9025926).

Almost surely, 2^18051851 is an apocalyptic number.

18051851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18051851 is an equidigital number, since it uses as much as digits as its factorization.

18051851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 18051851 is about 4248.7469917612. The cubic root of 18051851 is about 262.3255427361.

The spelling of 18051851 in words is "eighteen million, fifty-one thousand, eight hundred fifty-one".