206812685 has 4 divisors (see below), whose sum is σ = 248175228. Its totient is φ = 165450144.

The previous prime is 206812673. The next prime is 206812691. The reversal of 206812685 is 586218602.

206812685 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 107889769 + 98922916 = 10387^2 + 9946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206812685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20681264 + ... + 20681273.

It is an arithmetic number, because the mean of its divisors is an integer number (62043807).

Almost surely, 2^206812685 is an apocalyptic number.

It is an amenable number.

206812685 is a deficient number, since it is larger than the sum of its proper divisors (41362543).

206812685 is an equidigital number, since it uses as much as digits as its factorization.

206812685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41362542.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 206812685 is about 14380.9834503764. The cubic root of 206812685 is about 591.3696848088.

The spelling of 206812685 in words is "two hundred six million, eight hundred twelve thousand, six hundred eighty-five".