1816289117 has 2 divisors, whose sum is σ = 1816289118. Its totient is φ = 1816289116.

The previous prime is 1816289107. The next prime is 1816289147. The reversal of 1816289117 is 7119826181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1358585881 + 457703236 = 36859^2 + 21394^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816289117 - 2¹⁰ = 1816288093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816289107) 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, 908144558 + 908144559.

It is an arithmetic number, because the mean of its divisors is an integer number (908144559).

Almost surely, 2^1816289117 is an apocalyptic number.

It is an amenable number.

1816289117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816289117 is an equidigital number, since it uses as much as digits as its factorization.

1816289117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 44.

The square root of 1816289117 is about 42617.9436036043. The cubic root of 1816289117 is about 1220.0987819773.

The spelling of 1816289117 in words is "one billion, eight hundred sixteen million, two hundred eighty-nine thousand, one hundred seventeen".