199779049 has 2 divisors, whose sum is σ = 199779050. Its totient is φ = 199779048.

The previous prime is 199779007. The next prime is 199779067. The reversal of 199779049 is 940977991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198612649 + 1166400 = 14093^2 + 1080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199779049 is a prime.

It is not a weakly prime, because it can be changed into another prime (199779089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99889524 + 99889525.

It is an arithmetic number, because the mean of its divisors is an integer number (99889525).

Almost surely, 2^199779049 is an apocalyptic number.

It is an amenable number.

199779049 is a deficient number, since it is larger than the sum of its proper divisors (1).

199779049 is an equidigital number, since it uses as much as digits as its factorization.

199779049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 199779049 is about 14134.3216674873. The cubic root of 199779049 is about 584.5881134080.

The spelling of 199779049 in words is "one hundred ninety-nine million, seven hundred seventy-nine thousand, forty-nine".