1999838513 has 2 divisors, whose sum is σ = 1999838514. Its totient is φ = 1999838512.

The previous prime is 1999838507. The next prime is 1999838531. The reversal of 1999838513 is 3158389991.

Together with next prime (1999838531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1626266929 + 373571584 = 40327^2 + 19328^2 .

It is an emirp because it is prime and its reverse (3158389991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999838513 - 2⁸ = 1999838257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1999838573) 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, 999919256 + 999919257.

It is an arithmetic number, because the mean of its divisors is an integer number (999919257).

Almost surely, 2^1999838513 is an apocalyptic number.

It is an amenable number.

1999838513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999838513 is an equidigital number, since it uses as much as digits as its factorization.

1999838513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 56.

The square root of 1999838513 is about 44719.5540340017. The cubic root of 1999838513 is about 1259.8871388371.

The spelling of 1999838513 in words is "one billion, nine hundred ninety-nine million, eight hundred thirty-eight thousand, five hundred thirteen".