1818109 has 2 divisors, whose sum is σ = 1818110. Its totient is φ = 1818108.

The previous prime is 1818107. The next prime is 1818151. The reversal of 1818109 is 9018181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 205209 = 1270^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818109 - 2¹ = 1818107 is a prime.

Together with 1818107, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909054 + 909055.

It is an arithmetic number, because the mean of its divisors is an integer number (909055).

2^1818109 is an apocalyptic number.

It is an amenable number.

1818109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818109 is an equidigital number, since it uses as much as digits as its factorization.

1818109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1818109 is about 1348.3727229516. The cubic root of 1818109 is about 122.0506150278.

The spelling of 1818109 in words is "one million, eight hundred eighteen thousand, one hundred nine".