18113219 has 4 divisors (see below), whose sum is σ = 18160896. Its totient is φ = 18065544.

The previous prime is 18113209. The next prime is 18113231. The reversal of 18113219 is 91231181.

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

It is a cyclic number.

It is not a de Polignac number, because 18113219 - 2⁴ = 18113203 is a prime.

It is a super-2 number, since 2×18113219² = 656177405083922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18113209) 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, 23264 + ... + 24029.

It is an arithmetic number, because the mean of its divisors is an integer number (4540224).

Almost surely, 2^18113219 is an apocalyptic number.

18113219 is a deficient number, since it is larger than the sum of its proper divisors (47677).

18113219 is an equidigital number, since it uses as much as digits as its factorization.

18113219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47676.

The product of its digits is 432, while the sum is 26.

The square root of 18113219 is about 4255.9627582957. The cubic root of 18113219 is about 262.6224686285.

The spelling of 18113219 in words is "eighteen million, one hundred thirteen thousand, two hundred nineteen".