18224617 has 2 divisors, whose sum is σ = 18224618. Its totient is φ = 18224616.

The previous prime is 18224597. The next prime is 18224639. The reversal of 18224617 is 71642281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 256 = 4269^2 + 16^2 .

It is an emirp because it is prime and its reverse (71642281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18224617 is a prime.

It is not a weakly prime, because it can be changed into another prime (18224677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9112308 + 9112309.

It is an arithmetic number, because the mean of its divisors is an integer number (9112309).

Almost surely, 2^18224617 is an apocalyptic number.

It is an amenable number.

18224617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18224617 is an equidigital number, since it uses as much as digits as its factorization.

18224617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 18224617 is about 4269.0299834974. The cubic root of 18224617 is about 263.1597529714.

Adding to 18224617 its reverse (71642281), we get a palindrome (89866898).

The spelling of 18224617 in words is "eighteen million, two hundred twenty-four thousand, six hundred seventeen".