199680891 has 8 divisors (see below), whose sum is σ = 266390544. Its totient is φ = 133045920.

The previous prime is 199680883. The next prime is 199680893. The reversal of 199680891 is 198086991.

It is a happy number.

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

It is not a de Polignac number, because 199680891 - 2³ = 199680883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199680893) 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 7 ways as a sum of consecutive naturals, for example, 12100 + ... + 23361.

It is an arithmetic number, because the mean of its divisors is an integer number (33298818).

Almost surely, 2^199680891 is an apocalyptic number.

199680891 is a deficient number, since it is larger than the sum of its proper divisors (66709653).

199680891 is a wasteful number, since it uses less digits than its factorization.

199680891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37341.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 199680891 is about 14130.8489129281. The cubic root of 199680891 is about 584.4923552846.

The spelling of 199680891 in words is "one hundred ninety-nine million, six hundred eighty thousand, eight hundred ninety-one".