18081117 has 16 divisors (see below), whose sum is σ = 27002880. Its totient is φ = 11956896.

The previous prime is 18081097. The next prime is 18081131. The reversal of 18081117 is 71118081.

It is not a de Polignac number, because 18081117 - 2⁶ = 18081053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 793 + ... + 6065.

It is an arithmetic number, because the mean of its divisors is an integer number (1687680).

Almost surely, 2^18081117 is an apocalyptic number.

It is an amenable number.

18081117 is a deficient number, since it is larger than the sum of its proper divisors (8921763).

18081117 is a wasteful number, since it uses less digits than its factorization.

18081117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409 (or 5403 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The square root of 18081117 is about 4252.1896712165. The cubic root of 18081117 is about 262.4672285619.

Adding to 18081117 its reverse (71118081), we get a palindrome (89199198).

The spelling of 18081117 in words is "eighteen million, eighty-one thousand, one hundred seventeen".