206868691 has 4 divisors (see below), whose sum is σ = 210375000. Its totient is φ = 203362384.

The previous prime is 206868671. The next prime is 206868709. The reversal of 206868691 is 196868602.

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

It is a cyclic number.

It is not a de Polignac number, because 206868691 - 2¹¹ = 206866643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206868661) 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, 1753066 + ... + 1753183.

It is an arithmetic number, because the mean of its divisors is an integer number (52593750).

Almost surely, 2^206868691 is an apocalyptic number.

206868691 is a deficient number, since it is larger than the sum of its proper divisors (3506309).

206868691 is an equidigital number, since it uses as much as digits as its factorization.

206868691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506308.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 206868691 is about 14382.9305428344. The cubic root of 206868691 is about 591.4230620333.

The spelling of 206868691 in words is "two hundred six million, eight hundred sixty-eight thousand, six hundred ninety-one".