199968869 has 2 divisors, whose sum is σ = 199968870. Its totient is φ = 199968868.

The previous prime is 199968851. The next prime is 199968887. The reversal of 199968869 is 968869991.

It is a balanced prime because it is at equal distance from previous prime (199968851) and next prime (199968887).

It can be written as a sum of positive squares in only one way, i.e., 199176769 + 792100 = 14113^2 + 890^2 .

It is an emirp because it is prime and its reverse (968869991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199968869 is a prime.

It is a super-2 number, since 2×199968869² = 79975097138278322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199968269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99984434 + 99984435.

It is an arithmetic number, because the mean of its divisors is an integer number (99984435).

Almost surely, 2^199968869 is an apocalyptic number.

It is an amenable number.

199968869 is a deficient number, since it is larger than the sum of its proper divisors (1).

199968869 is an equidigital number, since it uses as much as digits as its factorization.

199968869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15116544, while the sum is 65.

The square root of 199968869 is about 14141.0349338371. The cubic root of 199968869 is about 584.7732035360.

The spelling of 199968869 in words is "one hundred ninety-nine million, nine hundred sixty-eight thousand, eight hundred sixty-nine".