198144305 has 4 divisors (see below), whose sum is σ = 237773172. Its totient is φ = 158515440.

The previous prime is 198144253. The next prime is 198144319. The reversal of 198144305 is 503441891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503441891 = 31 ⋅16240061.

It can be written as a sum of positive squares in 2 ways, for example, as 95101504 + 103042801 = 9752^2 + 10151^2 .

It is not a de Polignac number, because 198144305 - 2⁸ = 198144049 is a prime.

It is a super-3 number, since 3×198144305³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

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, 19814426 + ... + 19814435.

It is an arithmetic number, because the mean of its divisors is an integer number (59443293).

Almost surely, 2^198144305 is an apocalyptic number.

It is an amenable number.

198144305 is a deficient number, since it is larger than the sum of its proper divisors (39628867).

198144305 is an equidigital number, since it uses as much as digits as its factorization.

198144305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39628866.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 198144305 is about 14076.3740004307. The cubic root of 198144305 is about 582.9892296182.

The spelling of 198144305 in words is "one hundred ninety-eight million, one hundred forty-four thousand, three hundred five".