199657049 has 2 divisors, whose sum is σ = 199657050. Its totient is φ = 199657048.

The previous prime is 199657039. The next prime is 199657063. The reversal of 199657049 is 940756991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179694025 + 19963024 = 13405^2 + 4468^2 .

It is an emirp because it is prime and its reverse (940756991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199657049 - 2¹² = 199652953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 199656988 and 199657006.

It is not a weakly prime, because it can be changed into another prime (199657009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99828524 + 99828525.

It is an arithmetic number, because the mean of its divisors is an integer number (99828525).

Almost surely, 2^199657049 is an apocalyptic number.

It is an amenable number.

199657049 is a deficient number, since it is larger than the sum of its proper divisors (1).

199657049 is an equidigital number, since it uses as much as digits as its factorization.

199657049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 199657049 is about 14130.0052724689. The cubic root of 199657049 is about 584.4690914637.

The spelling of 199657049 in words is "one hundred ninety-nine million, six hundred fifty-seven thousand, forty-nine".