199690919 has 2 divisors, whose sum is σ = 199690920. Its totient is φ = 199690918.

The previous prime is 199690901. The next prime is 199690937. The reversal of 199690919 is 919096991.

It is a balanced prime because it is at equal distance from previous prime (199690901) and next prime (199690937).

It is a cyclic number.

It is not a de Polignac number, because 199690919 - 2²⁰ = 198642343 is a prime.

It is a super-2 number, since 2×199690919² = 79752926262129122, which contains 22 as substring.

It is a Sophie Germain 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 (199690949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99845459 + 99845460.

It is an arithmetic number, because the mean of its divisors is an integer number (99845460).

Almost surely, 2^199690919 is an apocalyptic number.

199690919 is a deficient number, since it is larger than the sum of its proper divisors (1).

199690919 is an equidigital number, since it uses as much as digits as its factorization.

199690919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 53.

The square root of 199690919 is about 14131.2037349972. The cubic root of 199690919 is about 584.5021395478.

The spelling of 199690919 in words is "one hundred ninety-nine million, six hundred ninety thousand, nine hundred nineteen".