18112133 has 4 divisors (see below), whose sum is σ = 19505388. Its totient is φ = 16718880.

The previous prime is 18112121. The next prime is 18112141. The reversal of 18112133 is 33121181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12124324 + 5987809 = 3482^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 18112133 - 2¹² = 18108037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112183) by changing a digit.

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, 696608 + ... + 696633.

It is an arithmetic number, because the mean of its divisors is an integer number (4876347).

Almost surely, 2^18112133 is an apocalyptic number.

18112133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18112133 is a deficient number, since it is larger than the sum of its proper divisors (1393255).

18112133 is a wasteful number, since it uses less digits than its factorization.

18112133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393254.

The product of its digits is 144, while the sum is 20.

The square root of 18112133 is about 4255.8351706804. The cubic root of 18112133 is about 262.6172199074.

The spelling of 18112133 in words is "eighteen million, one hundred twelve thousand, one hundred thirty-three".