199563857 has 2 divisors, whose sum is σ = 199563858. Its totient is φ = 199563856.

The previous prime is 199563811. The next prime is 199563869. The reversal of 199563857 is 758365991.

199563857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190467601 + 9096256 = 13801^2 + 3016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199563857 is a prime.

It is a super-3 number, since 3×199563857³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199563799 and 199563808.

It is not a weakly prime, because it can be changed into another prime (199563257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99781928 + 99781929.

It is an arithmetic number, because the mean of its divisors is an integer number (99781929).

Almost surely, 2^199563857 is an apocalyptic number.

It is an amenable number.

199563857 is a deficient number, since it is larger than the sum of its proper divisors (1).

199563857 is an equidigital number, since it uses as much as digits as its factorization.

199563857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 53.

The square root of 199563857 is about 14126.7072242614. The cubic root of 199563857 is about 584.3781416400.

The spelling of 199563857 in words is "one hundred ninety-nine million, five hundred sixty-three thousand, eight hundred fifty-seven".