198771172 has 6 divisors (see below), whose sum is σ = 347849558. Its totient is φ = 99385584.

The previous prime is 198771169. The next prime is 198771187. The reversal of 198771172 is 271177891.

It can be written as a sum of positive squares in only one way, i.e., 152176896 + 46594276 = 12336^2 + 6826^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24846393 + ... + 24846400.

Almost surely, 2^198771172 is an apocalyptic number.

It is an amenable number.

198771172 is a deficient number, since it is larger than the sum of its proper divisors (149078386).

198771172 is a wasteful number, since it uses less digits than its factorization.

198771172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49692797 (or 49692795 counting only the distinct ones).

The product of its digits is 49392, while the sum is 43.

The square root of 198771172 is about 14098.6230533340. The cubic root of 198771172 is about 583.6033813231.

The spelling of 198771172 in words is "one hundred ninety-eight million, seven hundred seventy-one thousand, one hundred seventy-two".