206009969 has 16 divisors (see below), whose sum is σ = 231538560. Its totient is φ = 181647360.

The previous prime is 206009941. The next prime is 206009971. The reversal of 206009969 is 969900602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206009969 - 2¹² = 206005873 is a prime.

It is a super-2 number, since 2×206009969² = 84880214654761922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206009369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178097 + ... + 179249.

It is an arithmetic number, because the mean of its divisors is an integer number (14471160).

Almost surely, 2^206009969 is an apocalyptic number.

It is an amenable number.

206009969 is a deficient number, since it is larger than the sum of its proper divisors (25528591).

206009969 is a wasteful number, since it uses less digits than its factorization.

206009969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 206009969 is about 14353.0473767768. The cubic root of 206009969 is about 590.6035851217.

The spelling of 206009969 in words is "two hundred six million, nine thousand, nine hundred sixty-nine".