199081709 has 8 divisors (see below), whose sum is σ = 200429880. Its totient is φ = 197738496.

The previous prime is 199081681. The next prime is 199081711. The reversal of 199081709 is 907180991.

It can be written as a sum of positive squares in 4 ways, for example, as 97515625 + 101566084 = 9875^2 + 10078^2 .

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 199081709 - 2⁸ = 199081453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199081709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199081759) 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, 110387 + ... + 112175.

It is an arithmetic number, because the mean of its divisors is an integer number (25053735).

Almost surely, 2^199081709 is an apocalyptic number.

It is an amenable number.

199081709 is a deficient number, since it is larger than the sum of its proper divisors (1348171).

199081709 is a wasteful number, since it uses less digits than its factorization.

199081709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 199081709 is about 14109.6317811628. The cubic root of 199081709 is about 583.9071412454.

The spelling of 199081709 in words is "one hundred ninety-nine million, eighty-one thousand, seven hundred nine".