198049817 has 12 divisors (see below), whose sum is σ = 234734436. Its totient is φ = 166551840.

The previous prime is 198049807. The next prime is 198049823. The reversal of 198049817 is 718940891.

It can be written as a sum of positive squares in 2 ways, for example, as 121242121 + 76807696 = 11011^2 + 8764^2 .

It is not a de Polignac number, because 198049817 - 2⁴ = 198049801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198049807) by changing a digit.

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, 35534 + ... + 40727.

It is an arithmetic number, because the mean of its divisors is an integer number (19561203).

Almost surely, 2^198049817 is an apocalyptic number.

It is an amenable number.

198049817 is a deficient number, since it is larger than the sum of its proper divisors (36684619).

198049817 is an equidigital number, since it uses as much as digits as its factorization.

198049817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76328 (or 76321 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 198049817 is about 14073.0173381546. The cubic root of 198049817 is about 582.8965459135.

The spelling of 198049817 in words is "one hundred ninety-eight million, forty-nine thousand, eight hundred seventeen".