198366109 has 4 divisors (see below), whose sum is σ = 198478780. Its totient is φ = 198253440.

The previous prime is 198366089. The next prime is 198366131. The reversal of 198366109 is 901663891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162486009 + 35880100 = 12747^2 + 5990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198366109 is a prime.

It is a super-2 number, since 2×198366109² = 78698226399599762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198366169) 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 3 ways as a sum of consecutive naturals, for example, 53652 + ... + 57229.

It is an arithmetic number, because the mean of its divisors is an integer number (49619695).

Almost surely, 2^198366109 is an apocalyptic number.

It is an amenable number.

198366109 is a deficient number, since it is larger than the sum of its proper divisors (112671).

198366109 is a wasteful number, since it uses less digits than its factorization.

198366109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112670.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 198366109 is about 14084.2503882883. The cubic root of 198366109 is about 583.2066824542.

The spelling of 198366109 in words is "one hundred ninety-eight million, three hundred sixty-six thousand, one hundred nine".