199080991 has 2 divisors, whose sum is σ = 199080992. Its totient is φ = 199080990.

The previous prime is 199080989. The next prime is 199080997.

199080991 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 199080991 - 2¹ = 199080989 is a prime.

Together with 199080989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199080997) 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 as a sum of consecutive naturals, namely, 99540495 + 99540496.

It is an arithmetic number, because the mean of its divisors is an integer number (99540496).

Almost surely, 2^199080991 is an apocalyptic number.

199080991 is a deficient number, since it is larger than the sum of its proper divisors (1).

199080991 is an equidigital number, since it uses as much as digits as its factorization.

199080991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 199080991 is about 14109.6063375276. The cubic root of 199080991 is about 583.9064392793.

The spelling of 199080991 in words is "one hundred ninety-nine million, eighty thousand, nine hundred ninety-one".