199891001 has 8 divisors (see below), whose sum is σ = 210566400. Its totient is φ = 189231120.

The previous prime is 199890991. The next prime is 199891079. The reversal of 199891001 is 100198991.

It is a happy number.

199891001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199891001 - 2¹⁴ = 199874617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199891201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30431 + ... + 36411.

It is an arithmetic number, because the mean of its divisors is an integer number (26320800).

Almost surely, 2^199891001 is an apocalyptic number.

It is an amenable number.

199891001 is a deficient number, since it is larger than the sum of its proper divisors (10675399).

199891001 is a wasteful number, since it uses less digits than its factorization.

199891001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7759.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 199891001 is about 14138.2814019244. The cubic root of 199891001 is about 584.6972900005.

The spelling of 199891001 in words is "one hundred ninety-nine million, eight hundred ninety-one thousand, one".