18009117 has 36 divisors (see below), whose sum is σ = 30644796. Its totient is φ = 10160640.

The previous prime is 18009107. The next prime is 18009119. The reversal of 18009117 is 71190081.

It can be written as a sum of positive squares in 2 ways, for example, as 2752281 + 15256836 = 1659^2 + 3906^2 .

It is not a de Polignac number, because 18009117 - 2⁷ = 18008989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009119) 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 35 ways as a sum of consecutive naturals, for example, 42567 + ... + 42987.

Almost surely, 2^18009117 is an apocalyptic number.

It is an amenable number.

18009117 is a deficient number, since it is larger than the sum of its proper divisors (12635679).

18009117 is a wasteful number, since it uses less digits than its factorization.

18009117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 18009117 is about 4243.7149998557. The cubic root of 18009117 is about 262.1183788032.

Adding to 18009117 its reverse (71190081), we get a palindrome (89199198).

The spelling of 18009117 in words is "eighteen million, nine thousand, one hundred seventeen".