206534709 has 12 divisors (see below), whose sum is σ = 299492076. Its totient is φ = 137152512.

The previous prime is 206534701. The next prime is 206534743. The reversal of 206534709 is 907435602.

It can be written as a sum of positive squares in 2 ways, for example, as 117288900 + 89245809 = 10830^2 + 9447^2 .

It is not a de Polignac number, because 206534709 - 2³ = 206534701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206534701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42334 + ... + 46959.

It is an arithmetic number, because the mean of its divisors is an integer number (24957673).

Almost surely, 2^206534709 is an apocalyptic number.

It is an amenable number.

206534709 is a deficient number, since it is larger than the sum of its proper divisors (92957367).

206534709 is a wasteful number, since it uses less digits than its factorization.

206534709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89556 (or 89553 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 206534709 is about 14371.3154930229. The cubic root of 206534709 is about 591.1046135682.

The spelling of 206534709 in words is "two hundred six million, five hundred thirty-four thousand, seven hundred nine".