198517 has 4 divisors (see below), whose sum is σ = 216576. Its totient is φ = 180460.

The previous prime is 198503. The next prime is 198529. The reversal of 198517 is 715891.

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 198517 - 2¹⁵ = 165749 is a prime.

It is a Duffinian number.

198517 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198017) 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, 9013 + ... + 9034.

It is an arithmetic number, because the mean of its divisors is an integer number (54144).

2¹⁹⁸⁵¹⁷ is an apocalyptic number.

It is an amenable number.

198517 is a deficient number, since it is larger than the sum of its proper divisors (18059).

198517 is a wasteful number, since it uses less digits than its factorization.

198517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18058.

The product of its digits is 2520, while the sum is 31.

The square root of 198517 is about 445.5524660464. The cubic root of 198517 is about 58.3354520772.

It can be divided in two parts, 1985 and 17, that added together give a palindrome (2002).

The spelling of 198517 in words is "one hundred ninety-eight thousand, five hundred seventeen".