18113505 has 16 divisors (see below), whose sum is σ = 29332800. Its totient is φ = 9543488.

The previous prime is 18113503. The next prime is 18113509. The reversal of 18113505 is 50531181.

It is a cyclic number.

It is not a de Polignac number, because 18113505 - 2¹ = 18113503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18113503) 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 15 ways as a sum of consecutive naturals, for example, 6030 + ... + 8519.

It is an arithmetic number, because the mean of its divisors is an integer number (1833300).

Almost surely, 2^18113505 is an apocalyptic number.

18113505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18113505 is a deficient number, since it is larger than the sum of its proper divisors (11219295).

18113505 is a wasteful number, since it uses less digits than its factorization.

18113505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14640.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 18113505 is about 4255.9963580811. The cubic root of 18113505 is about 262.6238508534.

Adding to 18113505 its reverse (50531181), we get a palindrome (68644686).

The spelling of 18113505 in words is "eighteen million, one hundred thirteen thousand, five hundred five".