199881193 has 2 divisors, whose sum is σ = 199881194. Its totient is φ = 199881192.

The previous prime is 199881169. The next prime is 199881221. The reversal of 199881193 is 391188991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189557824 + 10323369 = 13768^2 + 3213^2 .

It is a cyclic number.

It is not a de Polignac number, because 199881193 - 2⁵ = 199881161 is a prime.

It is not a weakly prime, because it can be changed into another prime (199881113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940596 + 99940597.

It is an arithmetic number, because the mean of its divisors is an integer number (99940597).

Almost surely, 2^199881193 is an apocalyptic number.

It is an amenable number.

199881193 is a deficient number, since it is larger than the sum of its proper divisors (1).

199881193 is an equidigital number, since it uses as much as digits as its factorization.

199881193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 49.

The square root of 199881193 is about 14137.9345379727. The cubic root of 199881193 is about 584.6877267805.

The spelling of 199881193 in words is "one hundred ninety-nine million, eight hundred eighty-one thousand, one hundred ninety-three".