198499561 has 16 divisors (see below), whose sum is σ = 220301200. Its totient is φ = 177666048.

The previous prime is 198499547. The next prime is 198499579. The reversal of 198499561 is 165994891.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6150400 + 192349161 = 2480^2 + 13869^2 .

It is a cyclic number.

It is not a de Polignac number, because 198499561 - 2¹³ = 198491369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198499499 and 198499508.

It is not an unprimeable number, because it can be changed into a prime (198491561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196225 + ... + 197233.

It is an arithmetic number, because the mean of its divisors is an integer number (13768825).

Almost surely, 2^198499561 is an apocalyptic number.

It is an amenable number.

198499561 is a deficient number, since it is larger than the sum of its proper divisors (21801639).

198499561 is a wasteful number, since it uses less digits than its factorization.

198499561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468.

The product of its digits is 699840, while the sum is 52.

The square root of 198499561 is about 14088.9872240697. The cubic root of 198499561 is about 583.3374384110.

The spelling of 198499561 in words is "one hundred ninety-eight million, four hundred ninety-nine thousand, five hundred sixty-one".