199912913 has 2 divisors, whose sum is σ = 199912914. Its totient is φ = 199912912.

The previous prime is 199912907. The next prime is 199912931. The reversal of 199912913 is 319219991.

Together with next prime (199912931) 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., 113571649 + 86341264 = 10657^2 + 9292^2 .

It is an emirp because it is prime and its reverse (319219991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199912913 - 2²² = 195718609 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 (199912513) 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, 99956456 + 99956457.

It is an arithmetic number, because the mean of its divisors is an integer number (99956457).

Almost surely, 2^199912913 is an apocalyptic number.

It is an amenable number.

199912913 is a deficient number, since it is larger than the sum of its proper divisors (1).

199912913 is an equidigital number, since it uses as much as digits as its factorization.

199912913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 44.

The square root of 199912913 is about 14139.0562980702. The cubic root of 199912913 is about 584.7186540086.

The spelling of 199912913 in words is "one hundred ninety-nine million, nine hundred twelve thousand, nine hundred thirteen".