18413609 has 2 divisors, whose sum is σ = 18413610. Its totient is φ = 18413608.

The previous prime is 18413581. The next prime is 18413617. The reversal of 18413609 is 90631481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13897984 + 4515625 = 3728^2 + 2125^2 .

It is an emirp because it is prime and its reverse (90631481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18413609 - 2¹² = 18409513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18413699) 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 as a sum of consecutive naturals, namely, 9206804 + 9206805.

It is an arithmetic number, because the mean of its divisors is an integer number (9206805).

Almost surely, 2^18413609 is an apocalyptic number.

It is an amenable number.

18413609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18413609 is an equidigital number, since it uses as much as digits as its factorization.

18413609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18413609 is about 4291.1081319398. The cubic root of 18413609 is about 264.0662951429.

The spelling of 18413609 in words is "eighteen million, four hundred thirteen thousand, six hundred nine".