206909317 has 8 divisors (see below), whose sum is σ = 208433600. Its totient is φ = 205390080.

The previous prime is 206909299. The next prime is 206909321. The reversal of 206909317 is 713909602.

206909317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206909317 - 2¹⁹ = 206385029 is a prime.

It is a super-2 number, since 2×206909317² = 85622930922812978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206909327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120934 + ... + 122632.

It is an arithmetic number, because the mean of its divisors is an integer number (26054200).

Almost surely, 2^206909317 is an apocalyptic number.

It is an amenable number.

206909317 is a deficient number, since it is larger than the sum of its proper divisors (1524283).

206909317 is a wasteful number, since it uses less digits than its factorization.

206909317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 206909317 is about 14384.3427726122. The cubic root of 206909317 is about 591.4617751263.

The spelling of 206909317 in words is "two hundred six million, nine hundred nine thousand, three hundred seventeen".