198291081 has 8 divisors (see below), whose sum is σ = 264616704. Its totient is φ = 132079760.

The previous prime is 198291059. The next prime is 198291089. The reversal of 198291081 is 180192891.

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 198291081 - 2¹¹ = 198289033 is a prime.

It is a super-2 number, since 2×198291081² = 78638705608297122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (198291089) 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, 24441 + ... + 31526.

It is an arithmetic number, because the mean of its divisors is an integer number (33077088).

Almost surely, 2^198291081 is an apocalyptic number.

It is an amenable number.

198291081 is a deficient number, since it is larger than the sum of its proper divisors (66325623).

198291081 is a wasteful number, since it uses less digits than its factorization.

198291081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57151.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 198291081 is about 14081.5865938466. The cubic root of 198291081 is about 583.1331444406.

It can be divided in two parts, 19829 and 1081, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 198291081 in words is "one hundred ninety-eight million, two hundred ninety-one thousand, eighty-one".