198912169 has 8 divisors (see below), whose sum is σ = 201313800. Its totient is φ = 196525056.

The previous prime is 198912167. The next prime is 198912193. The reversal of 198912169 is 961219891.

It can be written as a sum of positive squares in 4 ways, for example, as 2576025 + 196336144 = 1605^2 + 14012^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198912169 - 2¹ = 198912167 is a prime.

It is a super-2 number, since 2×198912169² = 79132101952569122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198912163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25299 + ... + 32215.

It is an arithmetic number, because the mean of its divisors is an integer number (25164225).

Almost surely, 2^198912169 is an apocalyptic number.

It is an amenable number.

198912169 is a deficient number, since it is larger than the sum of its proper divisors (2401631).

198912169 is a wasteful number, since it uses less digits than its factorization.

198912169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259.

The product of its digits is 69984, while the sum is 46.

The square root of 198912169 is about 14103.6225488347. The cubic root of 198912169 is about 583.7413404252.

The spelling of 198912169 in words is "one hundred ninety-eight million, nine hundred twelve thousand, one hundred sixty-nine".