199909223 has 2 divisors, whose sum is σ = 199909224. Its totient is φ = 199909222.

The previous prime is 199909217. The next prime is 199909247. The reversal of 199909223 is 322909991.

It is a weak prime.

It is an emirp because it is prime and its reverse (322909991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199909223 - 2⁶ = 199909159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199909253) 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, 99954611 + 99954612.

It is an arithmetic number, because the mean of its divisors is an integer number (99954612).

Almost surely, 2^199909223 is an apocalyptic number.

199909223 is a deficient number, since it is larger than the sum of its proper divisors (1).

199909223 is an equidigital number, since it uses as much as digits as its factorization.

199909223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 199909223 is about 14138.9258078540. The cubic root of 199909223 is about 584.7150564002.

The spelling of 199909223 in words is "one hundred ninety-nine million, nine hundred nine thousand, two hundred twenty-three".