199099919 has 2 divisors, whose sum is σ = 199099920. Its totient is φ = 199099918.

The previous prime is 199099871. The next prime is 199099921. The reversal of 199099919 is 919990991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199099919 - 2¹⁶ = 199034383 is a prime.

It is a super-2 number, since 2×199099919² = 79281555491613122, which contains 22 as substring.

Together with 199099921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199099939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99549959 + 99549960.

It is an arithmetic number, because the mean of its divisors is an integer number (99549960).

Almost surely, 2^199099919 is an apocalyptic number.

199099919 is a deficient number, since it is larger than the sum of its proper divisors (1).

199099919 is an equidigital number, since it uses as much as digits as its factorization.

199099919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 531441, while the sum is 56.

The square root of 199099919 is about 14110.2770702775. The cubic root of 199099919 is about 583.9249440275.

The spelling of 199099919 in words is "one hundred ninety-nine million, ninety-nine thousand, nine hundred nineteen".