198382581 has 8 divisors (see below), whose sum is σ = 293900160. Its totient is φ = 132255036.

The previous prime is 198382549. The next prime is 198382589. The reversal of 198382581 is 185283891.

It is a happy number.

198382581 is a `hidden beast` number, since 198 + 382 + 5 + 81 = 666.

It is not a de Polignac number, because 198382581 - 2⁵ = 198382549 is a prime.

It is a super-2 number, since 2×198382581² = 78711296888443122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198382589) 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, 3673725 + ... + 3673778.

It is an arithmetic number, because the mean of its divisors is an integer number (36737520).

Almost surely, 2^198382581 is an apocalyptic number.

It is an amenable number.

198382581 is a deficient number, since it is larger than the sum of its proper divisors (95517579).

198382581 is an equidigital number, since it uses as much as digits as its factorization.

198382581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347512 (or 7347506 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 198382581 is about 14084.8351428052. The cubic root of 198382581 is about 583.2228248531. Note that the first 3 decimals are identical.

The spelling of 198382581 in words is "one hundred ninety-eight million, three hundred eighty-two thousand, five hundred eighty-one".