199536979 has 2 divisors, whose sum is σ = 199536980. Its totient is φ = 199536978.

The previous prime is 199536971. The next prime is 199536991. The reversal of 199536979 is 979635991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199536979 - 2³ = 199536971 is a prime.

It is not a weakly prime, because it can be changed into another prime (199536971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99768489 + 99768490.

It is an arithmetic number, because the mean of its divisors is an integer number (99768490).

Almost surely, 2^199536979 is an apocalyptic number.

199536979 is a deficient number, since it is larger than the sum of its proper divisors (1).

199536979 is an equidigital number, since it uses as much as digits as its factorization.

199536979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4133430, while the sum is 58.

The square root of 199536979 is about 14125.7558735807. The cubic root of 199536979 is about 584.3519050573.

The spelling of 199536979 in words is "one hundred ninety-nine million, five hundred thirty-six thousand, nine hundred seventy-nine".