198000861 has 4 divisors (see below), whose sum is σ = 264001152. Its totient is φ = 132000572.

The previous prime is 198000857. The next prime is 198000863. The reversal of 198000861 is 168000891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198000861 - 2² = 198000857 is a prime.

198000861 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198000863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33000141 + ... + 33000146.

It is an arithmetic number, because the mean of its divisors is an integer number (66000288).

Almost surely, 2^198000861 is an apocalyptic number.

It is an amenable number.

198000861 is a deficient number, since it is larger than the sum of its proper divisors (66000291).

198000861 is an equidigital number, since it uses as much as digits as its factorization.

198000861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66000290.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 198000861 is about 14071.2778737398. The cubic root of 198000861 is about 582.8485131587.

The spelling of 198000861 in words is "one hundred ninety-eight million, eight hundred sixty-one", and thus it is an aban number.