18243851 has 2 divisors, whose sum is σ = 18243852. Its totient is φ = 18243850.

The previous prime is 18243833. The next prime is 18243877. The reversal of 18243851 is 15834281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18243851 - 2¹⁸ = 17981707 is a prime.

It is not a weakly prime, because it can be changed into another prime (18243881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9121925 + 9121926.

It is an arithmetic number, because the mean of its divisors is an integer number (9121926).

Almost surely, 2^18243851 is an apocalyptic number.

18243851 is a deficient number, since it is larger than the sum of its proper divisors (1).

18243851 is an equidigital number, since it uses as much as digits as its factorization.

18243851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 18243851 is about 4271.2821260132. The cubic root of 18243851 is about 263.2522987678.

The spelling of 18243851 in words is "eighteen million, two hundred forty-three thousand, eight hundred fifty-one".