199798491 has 4 divisors (see below), whose sum is σ = 266397992. Its totient is φ = 133198992.

The previous prime is 199798481. The next prime is 199798507. The reversal of 199798491 is 194897991.

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

It is not a de Polignac number, because 199798491 - 2¹³ = 199790299 is a prime.

It is a super-5 number, since 5×199798491⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199798451) 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, 33299746 + ... + 33299751.

It is an arithmetic number, because the mean of its divisors is an integer number (66599498).

Almost surely, 2^199798491 is an apocalyptic number.

199798491 is a deficient number, since it is larger than the sum of its proper divisors (66599501).

199798491 is an equidigital number, since it uses as much as digits as its factorization.

199798491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66599500.

The product of its digits is 1469664, while the sum is 57.

The square root of 199798491 is about 14135.0094092646. The cubic root of 199798491 is about 584.6070763464.

The spelling of 199798491 in words is "one hundred ninety-nine million, seven hundred ninety-eight thousand, four hundred ninety-one".