198424081 has 8 divisors (see below), whose sum is σ = 204246504. Its totient is φ = 192625920.

The previous prime is 198424069. The next prime is 198424099. The reversal of 198424081 is 180424891.

It can be written as a sum of positive squares in 4 ways, for example, as 66977856 + 131446225 = 8184^2 + 11465^2 .

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 198424081 - 2¹⁵ = 198391313 is a prime.

It is a super-2 number, since 2×198424081² = 78744231841389122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198424081.

It is not an unprimeable number, because it can be changed into a prime (198424781) 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, 11241 + ... + 22873.

It is an arithmetic number, because the mean of its divisors is an integer number (25530813).

Almost surely, 2^198424081 is an apocalyptic number.

It is an amenable number.

198424081 is a deficient number, since it is larger than the sum of its proper divisors (5822423).

198424081 is a wasteful number, since it uses less digits than its factorization.

198424081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12131.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 198424081 is about 14086.3082814483. The cubic root of 198424081 is about 583.2634904861.

The spelling of 198424081 in words is "one hundred ninety-eight million, four hundred twenty-four thousand, eighty-one".