199656887 has 2 divisors, whose sum is σ = 199656888. Its totient is φ = 199656886.

The previous prime is 199656817. The next prime is 199656913. The reversal of 199656887 is 788656991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199656887 - 2⁸ = 199656631 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 (199656817) 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, 99828443 + 99828444.

It is an arithmetic number, because the mean of its divisors is an integer number (99828444).

Almost surely, 2^199656887 is an apocalyptic number.

199656887 is a deficient number, since it is larger than the sum of its proper divisors (1).

199656887 is an equidigital number, since it uses as much as digits as its factorization.

199656887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 59.

The square root of 199656887 is about 14129.9995399858. Note that the first 3 decimals coincide. The cubic root of 199656887 is about 584.4689333860.

The spelling of 199656887 in words is "one hundred ninety-nine million, six hundred fifty-six thousand, eight hundred eighty-seven".