199941999 has 4 divisors (see below), whose sum is σ = 266589336. Its totient is φ = 133294664.

The previous prime is 199941991. The next prime is 199942009. The reversal of 199941999 is 999149991.

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

It is a cyclic number.

It is not a de Polignac number, because 199941999 - 2³ = 199941991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199941991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33323664 + ... + 33323669.

It is an arithmetic number, because the mean of its divisors is an integer number (66647334).

Almost surely, 2^199941999 is an apocalyptic number.

199941999 is a deficient number, since it is larger than the sum of its proper divisors (66647337).

199941999 is an equidigital number, since it uses as much as digits as its factorization.

199941999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66647336.

The product of its digits is 2125764, while the sum is 60.

The square root of 199941999 is about 14140.0848300143. The cubic root of 199941999 is about 584.7470101926.

The spelling of 199941999 in words is "one hundred ninety-nine million, nine hundred forty-one thousand, nine hundred ninety-nine".