18136117 has 4 divisors (see below), whose sum is σ = 18146380. Its totient is φ = 18125856.

The previous prime is 18136103. The next prime is 18136141. The reversal of 18136117 is 71163181.

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 1153476 + 16982641 = 1074^2 + 4121^2 .

It is a cyclic number.

It is not a de Polignac number, because 18136117 - 2¹¹ = 18134069 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 (18136177) 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, 1728 + ... + 6265.

It is an arithmetic number, because the mean of its divisors is an integer number (4536595).

Almost surely, 2^18136117 is an apocalyptic number.

It is an amenable number.

18136117 is a deficient number, since it is larger than the sum of its proper divisors (10263).

18136117 is an equidigital number, since it uses as much as digits as its factorization.

18136117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10262.

The product of its digits is 1008, while the sum is 28.

The square root of 18136117 is about 4258.6520167771. The cubic root of 18136117 is about 262.7330876014.

Adding to 18136117 its reverse (71163181), we get a palindrome (89299298).

The spelling of 18136117 in words is "eighteen million, one hundred thirty-six thousand, one hundred seventeen".