199994689 has 2 divisors, whose sum is σ = 199994690. Its totient is φ = 199994688.

The previous prime is 199994633. The next prime is 199994693. The reversal of 199994689 is 986499991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153958464 + 46036225 = 12408^2 + 6785^2 .

It is a cyclic number.

It is not a de Polignac number, because 199994689 - 2¹⁷ = 199863617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199994689.

It is not a weakly prime, because it can be changed into another prime (199994629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997344 + 99997345.

It is an arithmetic number, because the mean of its divisors is an integer number (99997345).

Almost surely, 2^199994689 is an apocalyptic number.

It is an amenable number.

199994689 is a deficient number, since it is larger than the sum of its proper divisors (1).

199994689 is an equidigital number, since it uses as much as digits as its factorization.

199994689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11337408, while the sum is 64.

The square root of 199994689 is about 14141.9478502786. The cubic root of 199994689 is about 584.7983711107.

The spelling of 199994689 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred eighty-nine".