206682691 has 4 divisors (see below), whose sum is σ = 206811352. Its totient is φ = 206554032.

The previous prime is 206682683. The next prime is 206682713. The reversal of 206682691 is 196286602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196286602 = 2 ⋅98143301.

It is a cyclic number.

It is not a de Polignac number, because 206682691 - 2³ = 206682683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206682191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61890 + ... + 65143.

It is an arithmetic number, because the mean of its divisors is an integer number (51702838).

Almost surely, 2^206682691 is an apocalyptic number.

206682691 is a deficient number, since it is larger than the sum of its proper divisors (128661).

206682691 is a wasteful number, since it uses less digits than its factorization.

206682691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128660.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 206682691 is about 14376.4630907605. The cubic root of 206682691 is about 591.2457552359.

The spelling of 206682691 in words is "two hundred six million, six hundred eighty-two thousand, six hundred ninety-one".