198274561 has 3 divisors (see below), whose sum is σ = 198288643. Its totient is φ = 198260480.

The previous prime is 198274523. The next prime is 198274577. The reversal of 198274561 is 165472891.

The square root of 198274561 is 14081.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165472891 = 499 ⋅331609.

It can be written as a sum of positive squares in only one way, i.e., 164634561 + 33640000 = 12831^2 + 5800^2 .

It is a de Polignac number, because none of the positive numbers 2^k-198274561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198274061) by changing a digit.

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 in 2 ways as a sum of consecutive naturals, for example, 7041 + ... + 21121.

Almost surely, 2^198274561 is an apocalyptic number.

198274561 is the 14081-st square number.

198274561 is the 7041-st centered octagonal number.

It is an amenable number.

198274561 is a deficient number, since it is larger than the sum of its proper divisors (14082).

198274561 is an frugal number, since it uses more digits than its factorization.

198274561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28162 (or 14081 counting only the distinct ones).

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

The cubic root of 198274561 is about 583.1169500207.

The spelling of 198274561 in words is "one hundred ninety-eight million, two hundred seventy-four thousand, five hundred sixty-one".