199245217 has 4 divisors (see below), whose sum is σ = 199373616. Its totient is φ = 199116820.

The previous prime is 199245131. The next prime is 199245239. The reversal of 199245217 is 712542991.

It is a happy number.

199245217 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, and also an emirpimes, since its reverse is a distinct semiprime: 712542991 = 211 ⋅3376981.

It is a cyclic number.

It is not a de Polignac number, because 199245217 - 2¹⁵ = 199212449 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 199245217.

It is not an unprimeable number, because it can be changed into a prime (199245257) 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, 61843 + ... + 64984.

It is an arithmetic number, because the mean of its divisors is an integer number (49843404).

Almost surely, 2^199245217 is an apocalyptic number.

It is an amenable number.

199245217 is a deficient number, since it is larger than the sum of its proper divisors (128399).

199245217 is a wasteful number, since it uses less digits than its factorization.

199245217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128398.

The product of its digits is 45360, while the sum is 40.

The square root of 199245217 is about 14115.4247899240. The cubic root of 199245217 is about 584.0669539565.

The spelling of 199245217 in words is "one hundred ninety-nine million, two hundred forty-five thousand, two hundred seventeen".