199963969 has 2 divisors, whose sum is σ = 199963970. Its totient is φ = 199963968.

The previous prime is 199963957. The next prime is 199963993. The reversal of 199963969 is 969369991.

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., 112784400 + 87179569 = 10620^2 + 9337^2 .

It is an emirp because it is prime and its reverse (969369991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199963969 - 2⁵ = 199963937 is a prime.

It is a super-2 number, since 2×199963969² = 79971177796465922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199963069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99981984 + 99981985.

It is an arithmetic number, because the mean of its divisors is an integer number (99981985).

Almost surely, 2^199963969 is an apocalyptic number.

It is an amenable number.

199963969 is a deficient number, since it is larger than the sum of its proper divisors (1).

199963969 is an equidigital number, since it uses as much as digits as its factorization.

199963969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6377292, while the sum is 61.

The square root of 199963969 is about 14140.8616781298. The cubic root of 199963969 is about 584.7684271057.

The spelling of 199963969 in words is "one hundred ninety-nine million, nine hundred sixty-three thousand, nine hundred sixty-nine".