199967899 has 2 divisors, whose sum is σ = 199967900. Its totient is φ = 199967898.

The previous prime is 199967863. The next prime is 199967903. The reversal of 199967899 is 998769991.

It is a strong prime.

It is an emirp because it is prime and its reverse (998769991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199967899 - 2¹¹ = 199965851 is a prime.

It is not a weakly prime, because it can be changed into another prime (199961899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99983949 + 99983950.

It is an arithmetic number, because the mean of its divisors is an integer number (99983950).

Almost surely, 2^199967899 is an apocalyptic number.

199967899 is a deficient number, since it is larger than the sum of its proper divisors (1).

199967899 is an equidigital number, since it uses as much as digits as its factorization.

199967899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19840464, while the sum is 67.

The square root of 199967899 is about 14141.0006364472. Note that the first 3 decimals coincide. The cubic root of 199967899 is about 584.7722580040.

The spelling of 199967899 in words is "one hundred ninety-nine million, nine hundred sixty-seven thousand, eight hundred ninety-nine".