18113217 has 4 divisors (see below), whose sum is σ = 24150960. Its totient is φ = 12075476.

The previous prime is 18113209. The next prime is 18113231. The reversal of 18113217 is 71231181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18113217 - 2³ = 18113209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18113237) 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, 3018867 + ... + 3018872.

It is an arithmetic number, because the mean of its divisors is an integer number (6037740).

Almost surely, 2^18113217 is an apocalyptic number.

It is an amenable number.

18113217 is a deficient number, since it is larger than the sum of its proper divisors (6037743).

18113217 is an equidigital number, since it uses as much as digits as its factorization.

18113217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6037742.

The product of its digits is 336, while the sum is 24.

The square root of 18113217 is about 4255.9625233312. The cubic root of 18113217 is about 262.6224589625.

Adding to 18113217 its reverse (71231181), we get a palindrome (89344398).

The spelling of 18113217 in words is "eighteen million, one hundred thirteen thousand, two hundred seventeen".