199678769 has 2 divisors, whose sum is σ = 199678770. Its totient is φ = 199678768.

The previous prime is 199678697. The next prime is 199678793. The reversal of 199678769 is 967876991.

It is a happy number.

Together with previous prime (199678697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101767744 + 97911025 = 10088^2 + 9895^2 .

It is an emirp because it is prime and its reverse (967876991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199678769 - 2²⁴ = 182901553 is a prime.

It is a super-2 number, since 2×199678769² = 79743221578710722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199678469) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99839384 + 99839385.

It is an arithmetic number, because the mean of its divisors is an integer number (99839385).

Almost surely, 2^199678769 is an apocalyptic number.

It is an amenable number.

199678769 is a deficient number, since it is larger than the sum of its proper divisors (1).

199678769 is an equidigital number, since it uses as much as digits as its factorization.

199678769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 62.

The square root of 199678769 is about 14130.7738287753. The cubic root of 199678769 is about 584.4902848191.

The spelling of 199678769 in words is "one hundred ninety-nine million, six hundred seventy-eight thousand, seven hundred sixty-nine".