199989911111 has 2 divisors, whose sum is σ = 199989911112. Its totient is φ = 199989911110.

The previous prime is 199989911057. The next prime is 199989911153. The reversal of 199989911111 is 111119989991.

It is a strong prime.

It is an emirp because it is prime and its reverse (111119989991) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 111116686661 and 166686611111.

It is a cyclic number.

It is not a de Polignac number, because 199989911111 - 2³⁴ = 182810041927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199989917111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99994955555 + 99994955556.

It is an arithmetic number, because the mean of its divisors is an integer number (99994955556).

Almost surely, 2^199989911111 is an apocalyptic number.

199989911111 is a deficient number, since it is larger than the sum of its proper divisors (1).

199989911111 is an equidigital number, since it uses as much as digits as its factorization.

199989911111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 59.

The spelling of 199989911111 in words is "one hundred ninety-nine billion, nine hundred eighty-nine million, nine hundred eleven thousand, one hundred eleven".