18411689 has 2 divisors, whose sum is σ = 18411690. Its totient is φ = 18411688.

The previous prime is 18411683. The next prime is 18411721. The reversal of 18411689 is 98611481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 67600 = 4283^2 + 260^2 .

It is an emirp because it is prime and its reverse (98611481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18411689 - 2²⁰ = 17363113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18411683) 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, 9205844 + 9205845.

It is an arithmetic number, because the mean of its divisors is an integer number (9205845).

Almost surely, 2^18411689 is an apocalyptic number.

It is an amenable number.

18411689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18411689 is an equidigital number, since it uses as much as digits as its factorization.

18411689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 38.

The square root of 18411689 is about 4290.8844076717. The cubic root of 18411689 is about 264.0571166976.

The spelling of 18411689 in words is "eighteen million, four hundred eleven thousand, six hundred eighty-nine".