18011285 has 4 divisors (see below), whose sum is σ = 21613548. Its totient is φ = 14409024.

The previous prime is 18011261. The next prime is 18011299. The reversal of 18011285 is 58211081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58211081 = 1373 ⋅42397.

It can be written as a sum of positive squares in 2 ways, for example, as 10182481 + 7828804 = 3191^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 18011285 - 2²² = 13816981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801124 + ... + 1801133.

It is an arithmetic number, because the mean of its divisors is an integer number (5403387).

Almost surely, 2^18011285 is an apocalyptic number.

It is an amenable number.

18011285 is a deficient number, since it is larger than the sum of its proper divisors (3602263).

18011285 is an equidigital number, since it uses as much as digits as its factorization.

18011285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602262.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18011285 is about 4243.9704287377. The cubic root of 18011285 is about 262.1288966212.

The spelling of 18011285 in words is "eighteen million, eleven thousand, two hundred eighty-five".