199991323 has 16 divisors (see below), whose sum is σ = 241432576. Its totient is φ = 162025920.

The previous prime is 199991303. The next prime is 199991339. The reversal of 199991323 is 323199991.

It is not a de Polignac number, because 199991323 - 2¹⁷ = 199860251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199991303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386 + ... + 20047.

It is an arithmetic number, because the mean of its divisors is an integer number (15089536).

Almost surely, 2^199991323 is an apocalyptic number.

199991323 is a deficient number, since it is larger than the sum of its proper divisors (41441253).

199991323 is a wasteful number, since it uses less digits than its factorization.

199991323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21514.

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

The square root of 199991323 is about 14141.8288421265. The cubic root of 199991323 is about 584.7950902863.

The spelling of 199991323 in words is "one hundred ninety-nine million, nine hundred ninety-one thousand, three hundred twenty-three".