198520197 has 4 divisors (see below), whose sum is σ = 264693600. Its totient is φ = 132346796.

The previous prime is 198520183. The next prime is 198520213. The reversal of 198520197 is 791025891.

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: 791025891 = 3 ⋅263675297.

It is a cyclic number.

It is not a de Polignac number, because 198520197 - 2¹⁴ = 198503813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198524197) 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, 33086697 + ... + 33086702.

It is an arithmetic number, because the mean of its divisors is an integer number (66173400).

Almost surely, 2^198520197 is an apocalyptic number.

It is an amenable number.

198520197 is a deficient number, since it is larger than the sum of its proper divisors (66173403).

198520197 is an equidigital number, since it uses as much as digits as its factorization.

198520197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66173402.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 198520197 is about 14089.7195500833. The cubic root of 198520197 is about 583.3576522832.

The spelling of 198520197 in words is "one hundred ninety-eight million, five hundred twenty thousand, one hundred ninety-seven".