199020991 has 12 divisors (see below), whose sum is σ = 226854120. Its totient is φ = 174039840.

The previous prime is 199020973. The next prime is 199021007.

199020991 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 199020991 - 2⁵ = 199020959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199020901) 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 in 11 ways as a sum of consecutive naturals, for example, 27780 + ... + 34201.

It is an arithmetic number, because the mean of its divisors is an integer number (18904510).

Almost surely, 2^199020991 is an apocalyptic number.

199020991 is a deficient number, since it is larger than the sum of its proper divisors (27833129).

199020991 is a wasteful number, since it uses less digits than its factorization.

199020991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62026 (or 62013 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 199020991 is about 14107.4799663157. The cubic root of 199020991 is about 583.8477731950.

The spelling of 199020991 in words is "one hundred ninety-nine million, twenty thousand, nine hundred ninety-one".