199656913 has 2 divisors, whose sum is σ = 199656914. Its totient is φ = 199656912.

The previous prime is 199656887. The next prime is 199656917. The reversal of 199656913 is 319656991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199148544 + 508369 = 14112^2 + 713^2 .

It is an emirp because it is prime and its reverse (319656991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199656913 is a prime.

It is not a weakly prime, because it can be changed into another prime (199656917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99828456 + 99828457.

It is an arithmetic number, because the mean of its divisors is an integer number (99828457).

Almost surely, 2^199656913 is an apocalyptic number.

It is an amenable number.

199656913 is a deficient number, since it is larger than the sum of its proper divisors (1).

199656913 is an equidigital number, since it uses as much as digits as its factorization.

199656913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 49.

The square root of 199656913 is about 14130.0004600141. Note that the first 3 decimals coincide. The cubic root of 199656913 is about 584.4689587565.

The spelling of 199656913 in words is "one hundred ninety-nine million, six hundred fifty-six thousand, nine hundred thirteen".