199991203 has 2 divisors, whose sum is σ = 199991204. Its totient is φ = 199991202.

The previous prime is 199991201. The next prime is 199991243. The reversal of 199991203 is 302199991.

It is a weak prime.

It is an emirp because it is prime and its reverse (302199991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199991203 - 2¹ = 199991201 is a prime.

Together with 199991201, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 199991203.

It is not a weakly prime, because it can be changed into another prime (199991201) 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 as a sum of consecutive naturals, namely, 99995601 + 99995602.

It is an arithmetic number, because the mean of its divisors is an integer number (99995602).

Almost surely, 2^199991203 is an apocalyptic number.

199991203 is a deficient number, since it is larger than the sum of its proper divisors (1).

199991203 is an equidigital number, since it uses as much as digits as its factorization.

199991203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 199991203 is about 14141.8245993931. The cubic root of 199991203 is about 584.7949733222.

The spelling of 199991203 in words is "one hundred ninety-nine million, nine hundred ninety-one thousand, two hundred three".