208616321 has 8 divisors (see below), whose sum is σ = 214182144. Its totient is φ = 203110960.

The previous prime is 208616311. The next prime is 208616347. The reversal of 208616321 is 123616802.

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 208616321 - 2¹⁸ = 208354177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208616311) 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, 8081 + ... + 21966.

It is an arithmetic number, because the mean of its divisors is an integer number (26772768).

Almost surely, 2^208616321 is an apocalyptic number.

It is an amenable number.

208616321 is a deficient number, since it is larger than the sum of its proper divisors (5565823).

208616321 is a wasteful number, since it uses less digits than its factorization.

208616321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30231.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 208616321 is about 14443.5563833843. The cubic root of 208616321 is about 593.0838444900.

The spelling of 208616321 in words is "two hundred eight million, six hundred sixteen thousand, three hundred twenty-one".