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208681 = 1161311
BaseRepresentation
bin110010111100101001
3101121020221
4302330221
523134211
64250041
71526254
oct627451
9347227
10208681
11132870
12a0921
1373ca5
145609b
1541c71
hex32f29

208681 has 8 divisors (see below), whose sum is σ = 232128. Its totient is φ = 186000.

The previous prime is 208673. The next prime is 208687. The reversal of 208681 is 186802.

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 208681 - 23 = 208673 is a prime.

It is a super-2 number, since 2×2086812 = 87095519522, which contains 22 as substring.

It is a Duffinian number.

208681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (208687) by changing a digit.

It is a Zeisel number, with parameters (5, 6).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 826.

It is an arithmetic number, because the mean of its divisors is an integer number (29016).

2208681 is an apocalyptic number.

It is an amenable number.

208681 is a deficient number, since it is larger than the sum of its proper divisors (23447).

208681 is a wasteful number, since it uses less digits than its factorization.

208681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 208681 is about 456.8161555812. The cubic root of 208681 is about 59.3145131012.

The spelling of 208681 in words is "two hundred eight thousand, six hundred eighty-one".

Divisors: 1 11 61 311 671 3421 18971 208681