198271645 has 48 divisors (see below), whose sum is σ = 285550272. Its totient is φ = 130990080.

The previous prime is 198271639. The next prime is 198271651. The reversal of 198271645 is 546172891.

It is an interprime number because it is at equal distance from previous prime (198271639) and next prime (198271651).

It is not a de Polignac number, because 198271645 - 2¹⁵ = 198238877 is a prime.

It is a super-2 number, since 2×198271645² = 78623290422012050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 771357 + ... + 771613.

It is an arithmetic number, because the mean of its divisors is an integer number (5948964).

Almost surely, 2^198271645 is an apocalyptic number.

It is an amenable number.

198271645 is a deficient number, since it is larger than the sum of its proper divisors (87278627).

198271645 is a wasteful number, since it uses less digits than its factorization.

198271645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 369 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 198271645 is about 14080.8964558369. The cubic root of 198271645 is about 583.1140913966.

It can be divided in two parts, 198271 and 645, that added together give a square (198916 = 446²).

The spelling of 198271645 in words is "one hundred ninety-eight million, two hundred seventy-one thousand, six hundred forty-five".