199669791 has 8 divisors (see below), whose sum is σ = 274814464. Its totient is φ = 128819160.

The previous prime is 199669787. The next prime is 199669793. The reversal of 199669791 is 197966991.

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

It is not a de Polignac number, because 199669791 - 2² = 199669787 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 (199669793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1073401 + ... + 1073586.

It is an arithmetic number, because the mean of its divisors is an integer number (34351808).

Almost surely, 2^199669791 is an apocalyptic number.

199669791 is a deficient number, since it is larger than the sum of its proper divisors (75144673).

199669791 is a wasteful number, since it uses less digits than its factorization.

199669791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147021.

The product of its digits is 1653372, while the sum is 57.

The square root of 199669791 is about 14130.4561497497. The cubic root of 199669791 is about 584.4815246949.

The spelling of 199669791 in words is "one hundred ninety-nine million, six hundred sixty-nine thousand, seven hundred ninety-one".