199832991 has 4 divisors (see below), whose sum is σ = 266443992. Its totient is φ = 133221992.

The previous prime is 199832959. The next prime is 199833001. The reversal of 199832991 is 199238991.

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 199832991 - 2⁵ = 199832959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199832951) 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, 33305496 + ... + 33305501.

It is an arithmetic number, because the mean of its divisors is an integer number (66610998).

Almost surely, 2^199832991 is an apocalyptic number.

199832991 is a deficient number, since it is larger than the sum of its proper divisors (66611001).

199832991 is an equidigital number, since it uses as much as digits as its factorization.

199832991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66611000.

The product of its digits is 314928, while the sum is 51.

The square root of 199832991 is about 14136.2297307309. The cubic root of 199832991 is about 584.6407232194.

The spelling of 199832991 in words is "one hundred ninety-nine million, eight hundred thirty-two thousand, nine hundred ninety-one".