199579799 has 2 divisors, whose sum is σ = 199579800. Its totient is φ = 199579798.

The previous prime is 199579789. The next prime is 199579843. The reversal of 199579799 is 997975991.

It is a weak prime.

It is an emirp because it is prime and its reverse (997975991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199579799 - 2⁸ = 199579543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199579789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99789899 + 99789900.

It is an arithmetic number, because the mean of its divisors is an integer number (99789900).

Almost surely, 2^199579799 is an apocalyptic number.

199579799 is a deficient number, since it is larger than the sum of its proper divisors (1).

199579799 is an equidigital number, since it uses as much as digits as its factorization.

199579799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14467005, while the sum is 65.

The square root of 199579799 is about 14127.2714633789. The cubic root of 199579799 is about 584.3937020867.

The spelling of 199579799 in words is "one hundred ninety-nine million, five hundred seventy-nine thousand, seven hundred ninety-nine".