206974009 has 6 divisors (see below), whose sum is σ = 227500490. Its totient is φ = 188158080.

The previous prime is 206974003. The next prime is 206974021. The reversal of 206974009 is 900479602.

It can be written as a sum of positive squares in only one way, i.e., 196084009 + 10890000 = 14003^2 + 3300^2 .

It is a de Polignac number, because none of the positive numbers 2^k-206974009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206974003) 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 5 ways as a sum of consecutive naturals, for example, 855144 + ... + 855385.

Almost surely, 2^206974009 is an apocalyptic number.

It is an amenable number.

206974009 is a deficient number, since it is larger than the sum of its proper divisors (20526481).

206974009 is a wasteful number, since it uses less digits than its factorization.

206974009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710551 (or 1710540 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 206974009 is about 14386.5912918940. The cubic root of 206974009 is about 591.5234105948.

The spelling of 206974009 in words is "two hundred six million, nine hundred seventy-four thousand, nine".