18133109 has 6 divisors (see below), whose sum is σ = 18737910. Its totient is φ = 17547240.

The previous prime is 18133099. The next prime is 18133133. The reversal of 18133109 is 90133181.

It can be written as a sum of positive squares in only one way, i.e., 18037009 + 96100 = 4247^2 + 310^2 .

It is not a de Polignac number, because 18133109 - 2²⁰ = 17084533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133139) 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 5 ways as a sum of consecutive naturals, for example, 8474 + ... + 10395.

It is an arithmetic number, because the mean of its divisors is an integer number (3122985).

Almost surely, 2^18133109 is an apocalyptic number.

It is an amenable number.

18133109 is a deficient number, since it is larger than the sum of its proper divisors (604801).

18133109 is an equidigital number, since it uses as much as digits as its factorization.

18133109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18931 (or 18900 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 18133109 is about 4258.2988387383. The cubic root of 18133109 is about 262.7185614338.

The spelling of 18133109 in words is "eighteen million, one hundred thirty-three thousand, one hundred nine".