198661331 has 8 divisors (see below), whose sum is σ = 220811184. Its totient is φ = 177193120.

The previous prime is 198661289. The next prime is 198661343. The reversal of 198661331 is 133166891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198661331 is a prime.

It is a super-2 number, since 2×198661331² = 78932648869383122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198661531) 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 7 ways as a sum of consecutive naturals, for example, 169796 + ... + 170961.

It is an arithmetic number, because the mean of its divisors is an integer number (27601398).

Almost surely, 2^198661331 is an apocalyptic number.

198661331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

198661331 is a deficient number, since it is larger than the sum of its proper divisors (22149853).

198661331 is a wasteful number, since it uses less digits than its factorization.

198661331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340821.

The product of its digits is 23328, while the sum is 38.

The square root of 198661331 is about 14094.7270636930. The cubic root of 198661331 is about 583.4958617235.

The spelling of 198661331 in words is "one hundred ninety-eight million, six hundred sixty-one thousand, three hundred thirty-one".