199964993 has 2 divisors, whose sum is σ = 199964994. Its totient is φ = 199964992.

The previous prime is 199964959. The next prime is 199965019. The reversal of 199964993 is 399469991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199854769 + 110224 = 14137^2 + 332^2 .

It is a cyclic number.

It is not a de Polignac number, because 199964993 - 2¹⁰ = 199963969 is a prime.

It is not a weakly prime, because it can be changed into another prime (199964953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99982496 + 99982497.

It is an arithmetic number, because the mean of its divisors is an integer number (99982497).

Almost surely, 2^199964993 is an apocalyptic number.

It is an amenable number.

199964993 is a deficient number, since it is larger than the sum of its proper divisors (1).

199964993 is an equidigital number, since it uses as much as digits as its factorization.

199964993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4251528, while the sum is 59.

The square root of 199964993 is about 14140.8978852122. The cubic root of 199964993 is about 584.7694252886.

The spelling of 199964993 in words is "one hundred ninety-nine million, nine hundred sixty-four thousand, nine hundred ninety-three".