199201581979 has 4 divisors (see below), whose sum is σ = 199203661800. Its totient is φ = 199199502160.

The previous prime is 199201581967. The next prime is 199201581983. The reversal of 199201581979 is 979185102991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199201581979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199201584979) 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, 888937 + ... + 1090234.

It is an arithmetic number, because the mean of its divisors is an integer number (49800915450).

Almost surely, 2^199201581979 is an apocalyptic number.

199201581979 is a deficient number, since it is larger than the sum of its proper divisors (2079821).

199201581979 is a wasteful number, since it uses less digits than its factorization.

199201581979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079820.

The product of its (nonzero) digits is 3674160, while the sum is 61.

The spelling of 199201581979 in words is "one hundred ninety-nine billion, two hundred one million, five hundred eighty-one thousand, nine hundred seventy-nine".