198206981 has 8 divisors (see below), whose sum is σ = 226617024. Its totient is φ = 169820640.

The previous prime is 198206977. The next prime is 198206989. The reversal of 198206981 is 189602891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198206981 - 2² = 198206977 is a prime.

It is a super-3 number, since 3×198206981³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198206989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19001 + ... + 27521.

It is an arithmetic number, because the mean of its divisors is an integer number (28327128).

Almost surely, 2^198206981 is an apocalyptic number.

It is an amenable number.

198206981 is a deficient number, since it is larger than the sum of its proper divisors (28410043).

198206981 is an equidigital number, since it uses as much as digits as its factorization.

198206981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 198206981 is about 14078.6001079653. The cubic root of 198206981 is about 583.0506925353.

The spelling of 198206981 in words is "one hundred ninety-eight million, two hundred six thousand, nine hundred eighty-one".