199999043 has 2 divisors, whose sum is σ = 199999044. Its totient is φ = 199999042.

The previous prime is 199999001. The next prime is 199999057. The reversal of 199999043 is 340999991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199999043 - 2²⁴ = 183221827 is a prime.

It is a Sophie Germain prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (199999343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999521 + 99999522.

It is an arithmetic number, because the mean of its divisors is an integer number (99999522).

Almost surely, 2^199999043 is an apocalyptic number.

199999043 is a deficient number, since it is larger than the sum of its proper divisors (1).

199999043 is an equidigital number, since it uses as much as digits as its factorization.

199999043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 708588, while the sum is 53.

The square root of 199999043 is about 14142.1017886310. The cubic root of 199999043 is about 584.8026148794.

The spelling of 199999043 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, forty-three".