206909291 has 12 divisors (see below), whose sum is σ = 213751440. Its totient is φ = 200279520.

The previous prime is 206909257. The next prime is 206909293. The reversal of 206909291 is 192909602.

It is not a de Polignac number, because 206909291 - 2¹⁰ = 206908267 is a prime.

It is a super-2 number, since 2×206909291² = 85622909404245362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206909293) 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, 491261 + ... + 491681.

It is an arithmetic number, because the mean of its divisors is an integer number (17812620).

Almost surely, 2^206909291 is an apocalyptic number.

206909291 is a deficient number, since it is larger than the sum of its proper divisors (6842149).

206909291 is an equidigital number, since it uses as much as digits as its factorization.

206909291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 206909291 is about 14384.3418688517. The cubic root of 206909291 is about 591.4617503521.

The spelling of 206909291 in words is "two hundred six million, nine hundred nine thousand, two hundred ninety-one".