199902869 has 2 divisors, whose sum is σ = 199902870. Its totient is φ = 199902868.

The previous prime is 199902809. The next prime is 199902907. The reversal of 199902869 is 968209991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116856100 + 83046769 = 10810^2 + 9113^2 .

It is a cyclic number.

It is not a de Polignac number, because 199902869 - 2⁸ = 199902613 is a prime.

It is a super-2 number, since 2×199902869² = 79922314068862322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199902869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199902809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99951434 + 99951435.

It is an arithmetic number, because the mean of its divisors is an integer number (99951435).

Almost surely, 2^199902869 is an apocalyptic number.

It is an amenable number.

199902869 is a deficient number, since it is larger than the sum of its proper divisors (1).

199902869 is an equidigital number, since it uses as much as digits as its factorization.

199902869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 199902869 is about 14138.7011072446. The cubic root of 199902869 is about 584.7088613903.

The spelling of 199902869 in words is "one hundred ninety-nine million, nine hundred two thousand, eight hundred sixty-nine".