199004491 has 4 divisors (see below), whose sum is σ = 227433712. Its totient is φ = 170575272.

The previous prime is 199004471. The next prime is 199004513. The reversal of 199004491 is 194400991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194400991 = 23 ⋅8452217.

It is not a de Polignac number, because 199004491 - 2⁹ = 199003979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199004491.

It is not an unprimeable number, because it can be changed into a prime (199004471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14214600 + ... + 14214613.

It is an arithmetic number, because the mean of its divisors is an integer number (56858428).

Almost surely, 2^199004491 is an apocalyptic number.

199004491 is a deficient number, since it is larger than the sum of its proper divisors (28429221).

199004491 is an equidigital number, since it uses as much as digits as its factorization.

199004491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28429220.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 199004491 is about 14106.8951580424. The cubic root of 199004491 is about 583.8316379548.

The spelling of 199004491 in words is "one hundred ninety-nine million, four thousand, four hundred ninety-one".