199725317 has 4 divisors (see below), whose sum is σ = 217882176. Its totient is φ = 181568460.

The previous prime is 199725301. The next prime is 199725319. The reversal of 199725317 is 713527991.

199725317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199725317 - 2⁴ = 199725301 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 (199725319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9078413 + ... + 9078434.

It is an arithmetic number, because the mean of its divisors is an integer number (54470544).

Almost surely, 2^199725317 is an apocalyptic number.

It is an amenable number.

199725317 is a deficient number, since it is larger than the sum of its proper divisors (18156859).

199725317 is a wasteful number, since it uses less digits than its factorization.

199725317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18156858.

The product of its digits is 119070, while the sum is 44.

The square root of 199725317 is about 14132.4207763568. The cubic root of 199725317 is about 584.5356989945.

The spelling of 199725317 in words is "one hundred ninety-nine million, seven hundred twenty-five thousand, three hundred seventeen".