199697917 has 8 divisors (see below), whose sum is σ = 207569376. Its totient is φ = 191956752.

The previous prime is 199697903. The next prime is 199698019. The reversal of 199697917 is 719796991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199697917 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 (199697717) 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, 29443 + ... + 35584.

It is an arithmetic number, because the mean of its divisors is an integer number (25946172).

Almost surely, 2^199697917 is an apocalyptic number.

It is an amenable number.

199697917 is a deficient number, since it is larger than the sum of its proper divisors (7871459).

199697917 is an equidigital number, since it uses as much as digits as its factorization.

199697917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65147.

The product of its digits is 1928934, while the sum is 58.

The square root of 199697917 is about 14131.4513408921. The cubic root of 199697917 is about 584.5089672631.

The spelling of 199697917 in words is "one hundred ninety-nine million, six hundred ninety-seven thousand, nine hundred seventeen".