199994693 has 2 divisors, whose sum is σ = 199994694. Its totient is φ = 199994692.

The previous prime is 199994689. The next prime is 199994699. The reversal of 199994693 is 396499991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186104164 + 13890529 = 13642^2 + 3727^2 .

It is an emirp because it is prime and its reverse (396499991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199994693 - 2² = 199994689 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199994699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997346 + 99997347.

It is an arithmetic number, because the mean of its divisors is an integer number (99997347).

Almost surely, 2^199994693 is an apocalyptic number.

It is an amenable number.

199994693 is a deficient number, since it is larger than the sum of its proper divisors (1).

199994693 is an equidigital number, since it uses as much as digits as its factorization.

199994693 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 199994693 is about 14141.9479917019. The cubic root of 199994693 is about 584.7983750094.

The spelling of 199994693 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred ninety-three".