18113155 has 4 divisors (see below), whose sum is σ = 21735792. Its totient is φ = 14490520.

The previous prime is 18113153. The next prime is 18113159. The reversal of 18113155 is 55131181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18113155 - 2¹ = 18113153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18113153) 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, 1811311 + ... + 1811320.

It is an arithmetic number, because the mean of its divisors is an integer number (5433948).

Almost surely, 2^18113155 is an apocalyptic number.

18113155 is a deficient number, since it is larger than the sum of its proper divisors (3622637).

18113155 is an equidigital number, since it uses as much as digits as its factorization.

18113155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622636.

The product of its digits is 600, while the sum is 25.

The square root of 18113155 is about 4255.9552394263. The cubic root of 18113155 is about 262.6221593174.

The spelling of 18113155 in words is "eighteen million, one hundred thirteen thousand, one hundred fifty-five".