209709105683 has 12 divisors (see below), whose sum is σ = 266124357432. Its totient is φ = 163409692320.

The previous prime is 209709105677. The next prime is 209709105689. The reversal of 209709105683 is 386501907902.

It is an interprime number because it is at equal distance from previous prime (209709105677) and next prime (209709105689).

It is not a de Polignac number, because 209709105683 - 2¹⁰ = 209709104659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209709105689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194534810 + ... + 194535887.

It is an arithmetic number, because the mean of its divisors is an integer number (22177029786).

Almost surely, 2^209709105683 is an apocalyptic number.

209709105683 is a deficient number, since it is larger than the sum of its proper divisors (56415251749).

209709105683 is a wasteful number, since it uses less digits than its factorization.

209709105683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389070722 (or 389070715 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 209709105683 in words is "two hundred nine billion, seven hundred nine million, one hundred five thousand, six hundred eighty-three".