198545 has 4 divisors (see below), whose sum is σ = 238260. Its totient is φ = 158832.

The previous prime is 198533. The next prime is 198553. The reversal of 198545 is 545891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545891 = 83 ⋅6577.

It can be written as a sum of positive squares in 2 ways, for example, as 132496 + 66049 = 364^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 198545 - 2⁴ = 198529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19850 + ... + 19859.

It is an arithmetic number, because the mean of its divisors is an integer number (59565).

2¹⁹⁸⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

198545 is a deficient number, since it is larger than the sum of its proper divisors (39715).

198545 is an equidigital number, since it uses as much as digits as its factorization.

198545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39714.

The product of its digits is 7200, while the sum is 32.

The square root of 198545 is about 445.5838866027. The cubic root of 198545 is about 58.3381946062.

The spelling of 198545 in words is "one hundred ninety-eight thousand, five hundred forty-five".