199919323 has 2 divisors, whose sum is σ = 199919324. Its totient is φ = 199919322.

The previous prime is 199919309. The next prime is 199919327. The reversal of 199919323 is 323919991.

It is a strong prime.

It is an emirp because it is prime and its reverse (323919991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199919323 - 2⁹ = 199918811 is a prime.

It is not a weakly prime, because it can be changed into another prime (199919327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99959661 + 99959662.

It is an arithmetic number, because the mean of its divisors is an integer number (99959662).

Almost surely, 2^199919323 is an apocalyptic number.

199919323 is a deficient number, since it is larger than the sum of its proper divisors (1).

199919323 is an equidigital number, since it uses as much as digits as its factorization.

199919323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098, while the sum is 46.

The square root of 199919323 is about 14139.2829733335. The cubic root of 199919323 is about 584.7249034073.

The spelling of 199919323 in words is "one hundred ninety-nine million, nine hundred nineteen thousand, three hundred twenty-three".