208820161 has 8 divisors (see below), whose sum is σ = 227908800. Its totient is φ = 189749040.

The previous prime is 208820153. The next prime is 208820177. The reversal of 208820161 is 161028802.

208820161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 208820161 - 2³ = 208820153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208820461) 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, 41500 + ... + 46258.

It is an arithmetic number, because the mean of its divisors is an integer number (28488600).

Almost surely, 2^208820161 is an apocalyptic number.

It is an amenable number.

208820161 is a deficient number, since it is larger than the sum of its proper divisors (19088639).

208820161 is a wasteful number, since it uses less digits than its factorization.

208820161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 208820161 is about 14450.6110943448. The cubic root of 208820161 is about 593.2769499578.

Adding to 208820161 its reverse (161028802), we get a palindrome (369848963).

It can be divided in two parts, 208820 and 161, that added together give a triangular number (208981 = T₆₄₆).

The spelling of 208820161 in words is "two hundred eight million, eight hundred twenty thousand, one hundred sixty-one".