199214779 has 2 divisors, whose sum is σ = 199214780. Its totient is φ = 199214778.

The previous prime is 199214759. The next prime is 199214783. The reversal of 199214779 is 977412991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199214779 - 2¹⁷ = 199083707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199214749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99607389 + 99607390.

It is an arithmetic number, because the mean of its divisors is an integer number (99607390).

Almost surely, 2^199214779 is an apocalyptic number.

199214779 is a deficient number, since it is larger than the sum of its proper divisors (1).

199214779 is an equidigital number, since it uses as much as digits as its factorization.

199214779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 285768, while the sum is 49.

The square root of 199214779 is about 14114.3465665258. The cubic root of 199214779 is about 584.0372104817.

The spelling of 199214779 in words is "one hundred ninety-nine million, two hundred fourteen thousand, seven hundred seventy-nine".