209206484639 has 16 divisors (see below), whose sum is σ = 217890324000. Its totient is φ = 200734150656.

The previous prime is 209206484573. The next prime is 209206484653. The reversal of 209206484639 is 936484602902.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209206484639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209206484689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430187 + ... + 776835.

It is an arithmetic number, because the mean of its divisors is an integer number (13618145250).

Almost surely, 2^209206484639 is an apocalyptic number.

209206484639 is a deficient number, since it is larger than the sum of its proper divisors (8683839361).

209206484639 is a wasteful number, since it uses less digits than its factorization.

209206484639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346954.

The product of its (nonzero) digits is 4478976, while the sum is 53.

The spelling of 209206484639 in words is "two hundred nine billion, two hundred six million, four hundred eighty-four thousand, six hundred thirty-nine".