199971079 has 16 divisors (see below), whose sum is σ = 250638336. Its totient is φ = 154994400.

The previous prime is 199971077. The next prime is 199971127. The reversal of 199971079 is 970179991.

It is not a de Polignac number, because 199971079 - 2¹ = 199971077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199971077) 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, 7909 + ... + 21505.

It is an arithmetic number, because the mean of its divisors is an integer number (15664896).

Almost surely, 2^199971079 is an apocalyptic number.

199971079 is a deficient number, since it is larger than the sum of its proper divisors (50667257).

199971079 is a wasteful number, since it uses less digits than its factorization.

199971079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13806.

The product of its (nonzero) digits is 321489, while the sum is 52.

The square root of 199971079 is about 14141.1130750023. The cubic root of 199971079 is about 584.7753577781.

The spelling of 199971079 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, seventy-nine".