1818007109 has 2 divisors, whose sum is σ = 1818007110. Its totient is φ = 1818007108.

The previous prime is 1818007057. The next prime is 1818007133. The reversal of 1818007109 is 9017008181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1753766884 + 64240225 = 41878^2 + 8015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818007109 - 2¹² = 1818003013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818007189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909003554 + 909003555.

It is an arithmetic number, because the mean of its divisors is an integer number (909003555).

Almost surely, 2^1818007109 is an apocalyptic number.

It is an amenable number.

1818007109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818007109 is an equidigital number, since it uses as much as digits as its factorization.

1818007109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 1818007109 is about 42638.0945751566. The cubic root of 1818007109 is about 1220.4833498638.

The spelling of 1818007109 in words is "one billion, eight hundred eighteen million, seven thousand, one hundred nine".