198000081 has 24 divisors (see below), whose sum is σ = 298172160. Its totient is φ = 126453600.

The previous prime is 198000073. The next prime is 198000119. The reversal of 198000081 is 180000891.

It is not a de Polignac number, because 198000081 - 2³ = 198000073 is a prime.

It is a super-2 number, since 2×198000081² = 78408064152013122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198000001) 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 23 ways as a sum of consecutive naturals, for example, 31296 + ... + 37086.

It is an arithmetic number, because the mean of its divisors is an integer number (12423840).

Almost surely, 2^198000081 is an apocalyptic number.

It is an amenable number.

198000081 is a deficient number, since it is larger than the sum of its proper divisors (100172079).

198000081 is a wasteful number, since it uses less digits than its factorization.

198000081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5954 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 198000081 is about 14071.2501576797. The cubic root of 198000081 is about 582.8477478044.

The spelling of 198000081 in words is "one hundred ninety-eight million, eighty-one", and thus it is an aban number.