206409001 has 4 divisors (see below), whose sum is σ = 206440272. Its totient is φ = 206377732.

The previous prime is 206408959. The next prime is 206409011. The reversal of 206409001 is 100904602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206409001 - 2¹³ = 206400809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206409011) 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 3 ways as a sum of consecutive naturals, for example, 1435 + ... + 20368.

It is an arithmetic number, because the mean of its divisors is an integer number (51610068).

Almost surely, 2^206409001 is an apocalyptic number.

It is an amenable number.

206409001 is a deficient number, since it is larger than the sum of its proper divisors (31271).

206409001 is an equidigital number, since it uses as much as digits as its factorization.

206409001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31270.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 206409001 is about 14366.9412541431. The cubic root of 206409001 is about 590.9846633350.

The spelling of 206409001 in words is "two hundred six million, four hundred nine thousand, one".