199993279 has 2 divisors, whose sum is σ = 199993280. Its totient is φ = 199993278.

The previous prime is 199993273. The next prime is 199993289. The reversal of 199993279 is 972399991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199993279 - 2³ = 199993271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199993271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99996639 + 99996640.

It is an arithmetic number, because the mean of its divisors is an integer number (99996640).

Almost surely, 2^199993279 is an apocalyptic number.

199993279 is a deficient number, since it is larger than the sum of its proper divisors (1).

199993279 is an equidigital number, since it uses as much as digits as its factorization.

199993279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2480058, while the sum is 58.

The square root of 199993279 is about 14141.8979985008. The cubic root of 199993279 is about 584.7969967948.

The spelling of 199993279 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, two hundred seventy-nine".