206881 has 4 divisors (see below), whose sum is σ = 207792. Its totient is φ = 205972.

The previous prime is 206879. The next prime is 206887. The reversal of 206881 is 188602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 206881 - 2¹ = 206879 is a prime.

It is a super-2 number, since 2×206881² = 85599496322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210 + ... + 676.

It is an arithmetic number, because the mean of its divisors is an integer number (51948).

2²⁰⁶⁸⁸¹ is an apocalyptic number.

It is an amenable number.

206881 is a deficient number, since it is larger than the sum of its proper divisors (911).

206881 is an equidigital number, since it uses as much as digits as its factorization.

206881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

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

The square root of 206881 is about 454.8417307152. The cubic root of 206881 is about 59.1434791990.

The spelling of 206881 in words is "two hundred six thousand, eight hundred eighty-one".