199930091 has 4 divisors (see below), whose sum is σ = 204579672. Its totient is φ = 195280512.

The previous prime is 199930079. The next prime is 199930097. The reversal of 199930091 is 190039991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190039991 = 17 ⋅11178823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199930091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199930097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2324726 + ... + 2324811.

It is an arithmetic number, because the mean of its divisors is an integer number (51144918).

Almost surely, 2^199930091 is an apocalyptic number.

199930091 is a deficient number, since it is larger than the sum of its proper divisors (4649581).

199930091 is an equidigital number, since it uses as much as digits as its factorization.

199930091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4649580.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 199930091 is about 14139.6637513061. The cubic root of 199930091 is about 584.7354013165.

The spelling of 199930091 in words is "one hundred ninety-nine million, nine hundred thirty thousand, ninety-one".