208242181 has 8 divisors (see below), whose sum is σ = 238472000. Its totient is φ = 178132608.

The previous prime is 208242149. The next prime is 208242191. The reversal of 208242181 is 181242802.

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 208242181 - 2⁵ = 208242149 is a prime.

It is a super-2 number, since 2×208242181² = 86729611895273522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208242191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26316 + ... + 33301.

It is an arithmetic number, because the mean of its divisors is an integer number (29809000).

Almost surely, 2^208242181 is an apocalyptic number.

It is an amenable number.

208242181 is a deficient number, since it is larger than the sum of its proper divisors (30229819).

208242181 is an equidigital number, since it uses as much as digits as its factorization.

208242181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60123.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 208242181 is about 14430.5987748257. The cubic root of 208242181 is about 592.7290797028.

Adding to 208242181 its reverse (181242802), we get a palindrome (389484983).

It can be divided in two parts, 20824 and 2181, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 208242181 in words is "two hundred eight million, two hundred forty-two thousand, one hundred eighty-one".