208661 has 8 divisors (see below), whose sum is σ = 221184. Its totient is φ = 196560.

The previous prime is 208657. The next prime is 208667. The reversal of 208661 is 166802.

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 208661 - 2² = 208657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208667) 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, 1580 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (27648).

2²⁰⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

208661 is a deficient number, since it is larger than the sum of its proper divisors (12523).

208661 is a wasteful number, since it uses less digits than its factorization.

208661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 208661 is about 456.7942644123. The cubic root of 208661 is about 59.3126181385.

The spelling of 208661 in words is "two hundred eight thousand, six hundred sixty-one".