199994087 has 2 divisors, whose sum is σ = 199994088. Its totient is φ = 199994086.

The previous prime is 199994077. The next prime is 199994141. The reversal of 199994087 is 780499991.

It is a weak prime.

It is an emirp because it is prime and its reverse (780499991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199994087 - 2²⁰ = 198945511 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 (199994017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997043 + 99997044.

It is an arithmetic number, because the mean of its divisors is an integer number (99997044).

Almost surely, 2^199994087 is an apocalyptic number.

199994087 is a deficient number, since it is larger than the sum of its proper divisors (1).

199994087 is an equidigital number, since it uses as much as digits as its factorization.

199994087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 199994087 is about 14141.9265660659. The cubic root of 199994087 is about 584.7977843468.

The spelling of 199994087 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, eighty-seven".