199979011 has 4 divisors (see below), whose sum is σ = 200147832. Its totient is φ = 199810192.

The previous prime is 199978991. The next prime is 199979023. The reversal of 199979011 is 110979991.

It is a happy number.

199979011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110979991 = 23 ⋅4825217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199979011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199979051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82621 + ... + 85006.

It is an arithmetic number, because the mean of its divisors is an integer number (50036958).

Almost surely, 2^199979011 is an apocalyptic number.

199979011 is a deficient number, since it is larger than the sum of its proper divisors (168821).

199979011 is a wasteful number, since it uses less digits than its factorization.

199979011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168820.

The product of its (nonzero) digits is 45927, while the sum is 46.

The square root of 199979011 is about 14141.3935310492. The cubic root of 199979011 is about 584.7830895241.

The spelling of 199979011 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, eleven".