18071109 has 48 divisors (see below), whose sum is σ = 32481280. Its totient is φ = 9447840.

The previous prime is 18071107. The next prime is 18071111. The reversal of 18071109 is 90117081.

It is an interprime number because it is at equal distance from previous prime (18071107) and next prime (18071111).

It is not a de Polignac number, because 18071109 - 2¹ = 18071107 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36864 + ... + 37350.

Almost surely, 2^18071109 is an apocalyptic number.

18071109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18071109 is a deficient number, since it is larger than the sum of its proper divisors (14410171).

18071109 is a wasteful number, since it uses less digits than its factorization.

18071109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 547 counting only the distinct ones).

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

The square root of 18071109 is about 4251.0127028745. The cubic root of 18071109 is about 262.4187939286.

It can be divided in two parts, 1807 and 1109, that added together give a square (2916 = 54²).

The spelling of 18071109 in words is "eighteen million, seventy-one thousand, one hundred nine".