199890179 has 2 divisors, whose sum is σ = 199890180. Its totient is φ = 199890178.

The previous prime is 199890137. The next prime is 199890209. The reversal of 199890179 is 971098991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199890179 - 2¹⁶ = 199824643 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199890179.

It is not a weakly prime, because it can be changed into another prime (199890109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99945089 + 99945090.

It is an arithmetic number, because the mean of its divisors is an integer number (99945090).

Almost surely, 2^199890179 is an apocalyptic number.

199890179 is a deficient number, since it is larger than the sum of its proper divisors (1).

199890179 is an equidigital number, since it uses as much as digits as its factorization.

199890179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 199890179 is about 14138.2523318832. The cubic root of 199890179 is about 584.6964885273.

The spelling of 199890179 in words is "one hundred ninety-nine million, eight hundred ninety thousand, one hundred seventy-nine".