198867617 has 4 divisors (see below), whose sum is σ = 214165140. Its totient is φ = 183570096.

The previous prime is 198867611. The next prime is 198867619. The reversal of 198867617 is 716768891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716768891 = 263 ⋅2725357.

It can be written as a sum of positive squares in 2 ways, for example, as 133079296 + 65788321 = 11536^2 + 8111^2 .

It is a cyclic number.

It is not a de Polignac number, because 198867617 - 2⁶ = 198867553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198867611) 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, 7648742 + ... + 7648767.

It is an arithmetic number, because the mean of its divisors is an integer number (53541285).

Almost surely, 2^198867617 is an apocalyptic number.

It is an amenable number.

198867617 is a deficient number, since it is larger than the sum of its proper divisors (15297523).

198867617 is a wasteful number, since it uses less digits than its factorization.

198867617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15297522.

The product of its digits is 1016064, while the sum is 53.

The square root of 198867617 is about 14102.0430080184. The cubic root of 198867617 is about 583.6977553825.

The spelling of 198867617 in words is "one hundred ninety-eight million, eight hundred sixty-seven thousand, six hundred seventeen".