199997099 has 4 divisors (see below), whose sum is σ = 205402464. Its totient is φ = 194591736.

The previous prime is 199997081. The next prime is 199997107. The reversal of 199997099 is 990799991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199997099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199997009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2702627 + ... + 2702700.

It is an arithmetic number, because the mean of its divisors is an integer number (51350616).

Almost surely, 2^199997099 is an apocalyptic number.

199997099 is a deficient number, since it is larger than the sum of its proper divisors (5405365).

199997099 is an equidigital number, since it uses as much as digits as its factorization.

199997099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405364.

The product of its (nonzero) digits is 3720087, while the sum is 62.

The square root of 199997099 is about 14142.0330575204. The cubic root of 199997099 is about 584.8007201037.

The spelling of 199997099 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, ninety-nine".