199878563 has 2 divisors, whose sum is σ = 199878564. Its totient is φ = 199878562.

The previous prime is 199878521. The next prime is 199878589. The reversal of 199878563 is 365878991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199878563 - 2¹⁰ = 199877539 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 199878499 and 199878508.

It is not a weakly prime, because it can be changed into another prime (199875563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99939281 + 99939282.

It is an arithmetic number, because the mean of its divisors is an integer number (99939282).

Almost surely, 2^199878563 is an apocalyptic number.

199878563 is a deficient number, since it is larger than the sum of its proper divisors (1).

199878563 is an equidigital number, since it uses as much as digits as its factorization.

199878563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 56.

The square root of 199878563 is about 14137.8415254946. The cubic root of 199878563 is about 584.6851623647.

The spelling of 199878563 in words is "one hundred ninety-nine million, eight hundred seventy-eight thousand, five hundred sixty-three".