206708681 has 4 divisors (see below), whose sum is σ = 207294612. Its totient is φ = 206122752.

The previous prime is 206708653. The next prime is 206708693. The reversal of 206708681 is 186807602.

206708681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125798656 + 80910025 = 11216^2 + 8995^2 .

It is a cyclic number.

It is not a de Polignac number, because 206708681 - 2⁶ = 206708617 is a prime.

It is a super-2 number, since 2×206708681² = 85456957601519522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206708081) 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, 292436 + ... + 293141.

It is an arithmetic number, because the mean of its divisors is an integer number (51823653).

Almost surely, 2^206708681 is an apocalyptic number.

It is an amenable number.

206708681 is a deficient number, since it is larger than the sum of its proper divisors (585931).

206708681 is an equidigital number, since it uses as much as digits as its factorization.

206708681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585930.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 206708681 is about 14377.3669703461. The cubic root of 206708681 is about 591.2705369162.

The spelling of 206708681 in words is "two hundred six million, seven hundred eight thousand, six hundred eighty-one".