199491011 has 4 divisors (see below), whose sum is σ = 199927992. Its totient is φ = 199054032.

The previous prime is 199491007. The next prime is 199491031. The reversal of 199491011 is 110194991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199491011 - 2² = 199491007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199491031) 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 in 3 ways as a sum of consecutive naturals, for example, 217805 + ... + 218718.

It is an arithmetic number, because the mean of its divisors is an integer number (49981998).

Almost surely, 2^199491011 is an apocalyptic number.

199491011 is a deficient number, since it is larger than the sum of its proper divisors (436981).

199491011 is an equidigital number, since it uses as much as digits as its factorization.

199491011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436980.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 199491011 is about 14124.1286810904. The cubic root of 199491011 is about 584.3070285780.

The spelling of 199491011 in words is "one hundred ninety-nine million, four hundred ninety-one thousand, eleven".