199680911 has 2 divisors, whose sum is σ = 199680912. Its totient is φ = 199680910.

The previous prime is 199680907. The next prime is 199680931. The reversal of 199680911 is 119086991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199680911 - 2² = 199680907 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199680931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99840455 + 99840456.

It is an arithmetic number, because the mean of its divisors is an integer number (99840456).

Almost surely, 2^199680911 is an apocalyptic number.

199680911 is a deficient number, since it is larger than the sum of its proper divisors (1).

199680911 is an equidigital number, since it uses as much as digits as its factorization.

199680911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 199680911 is about 14130.8496205996. The cubic root of 199680911 is about 584.4923747988.

The spelling of 199680911 in words is "one hundred ninety-nine million, six hundred eighty thousand, nine hundred eleven".