206009001 has 80 divisors (see below), whose sum is σ = 362883840. Its totient is φ = 115123680.

The previous prime is 206008997. The next prime is 206009053. The reversal of 206009001 is 100900602.

206009001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206009001 - 2² = 206008997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206009201) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 727806 + ... + 728088.

It is an arithmetic number, because the mean of its divisors is an integer number (4536048).

Almost surely, 2^206009001 is an apocalyptic number.

It is an amenable number.

206009001 is a deficient number, since it is larger than the sum of its proper divisors (156874839).

206009001 is a wasteful number, since it uses less digits than its factorization.

206009001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 206009001 is about 14353.0136556752. The cubic root of 206009001 is about 590.6026600772.

Adding to 206009001 its reverse (100900602), we get a palindrome (306909603).

The spelling of 206009001 in words is "two hundred six million, nine thousand, one".