18210133 has 4 divisors (see below), whose sum is σ = 18218700. Its totient is φ = 18201568.

The previous prime is 18210119. The next prime is 18210139. The reversal of 18210133 is 33101281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16630084 + 1580049 = 4078^2 + 1257^2 .

It is a cyclic number.

It is not a de Polignac number, because 18210133 - 2⁹ = 18209621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18210133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1593 + ... + 6241.

It is an arithmetic number, because the mean of its divisors is an integer number (4554675).

Almost surely, 2^18210133 is an apocalyptic number.

It is an amenable number.

18210133 is a deficient number, since it is larger than the sum of its proper divisors (8567).

18210133 is an equidigital number, since it uses as much as digits as its factorization.

18210133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18210133 is about 4267.3332422017. Note that the first 3 decimals coincide. The cubic root of 18210133 is about 263.0900191591.

The spelling of 18210133 in words is "eighteen million, two hundred ten thousand, one hundred thirty-three".