199191011 has 2 divisors, whose sum is σ = 199191012. Its totient is φ = 199191010.

The previous prime is 199190993. The next prime is 199191037. The reversal of 199191011 is 110191991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199191011 - 2²⁶ = 132082147 is a prime.

It is not a weakly prime, because it can be changed into another prime (199191511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99595505 + 99595506.

It is an arithmetic number, because the mean of its divisors is an integer number (99595506).

Almost surely, 2^199191011 is an apocalyptic number.

199191011 is a deficient number, since it is larger than the sum of its proper divisors (1).

199191011 is an equidigital number, since it uses as much as digits as its factorization.

199191011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 32.

The square root of 199191011 is about 14113.5045612350. The cubic root of 199191011 is about 584.0139827061.

The spelling of 199191011 in words is "one hundred ninety-nine million, one hundred ninety-one thousand, eleven".