198181825 has 12 divisors (see below), whose sum is σ = 246216508. Its totient is φ = 158241600.

The previous prime is 198181811. The next prime is 198181847. The reversal of 198181825 is 528181891.

It can be written as a sum of positive squares in 6 ways, for example, as 132496 + 198049329 = 364^2 + 14073^2 .

It is not a de Polignac number, because 198181825 - 2⁵ = 198181793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6199 + ... + 20851.

Almost surely, 2^198181825 is an apocalyptic number.

It is an amenable number.

198181825 is a deficient number, since it is larger than the sum of its proper divisors (48034683).

198181825 is a wasteful number, since it uses less digits than its factorization.

198181825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15204 (or 15199 counting only the distinct ones).

The product of its digits is 46080, while the sum is 43.

The square root of 198181825 is about 14077.7066669255. The cubic root of 198181825 is about 583.0260249821.

The spelling of 198181825 in words is "one hundred ninety-eight million, one hundred eighty-one thousand, eight hundred twenty-five".