18086281 has 4 divisors (see below), whose sum is σ = 18304272. Its totient is φ = 17868292.

The previous prime is 18086279. The next prime is 18086357. The reversal of 18086281 is 18268081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18086281 - 2¹ = 18086279 is a prime.

It is a super-2 number, since 2×18086281² = 654227120821922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18086221) 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 in 3 ways as a sum of consecutive naturals, for example, 108871 + ... + 109036.

It is an arithmetic number, because the mean of its divisors is an integer number (4576068).

Almost surely, 2^18086281 is an apocalyptic number.

It is an amenable number.

18086281 is a deficient number, since it is larger than the sum of its proper divisors (217991).

18086281 is an equidigital number, since it uses as much as digits as its factorization.

18086281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217990.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 18086281 is about 4252.7968444307. The cubic root of 18086281 is about 262.4922132233.

The spelling of 18086281 in words is "eighteen million, eighty-six thousand, two hundred eighty-one".