209618104971 has 32 divisors (see below), whose sum is σ = 326723943168. Its totient is φ = 118127651840.

The previous prime is 209618104967. The next prime is 209618104991. The reversal of 209618104971 is 179401816902.

209618104971 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 209618104971 - 2² = 209618104967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209618104971.

It is not an unprimeable number, because it can be changed into a prime (209618104921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2204346 + ... + 2297471.

It is an arithmetic number, because the mean of its divisors is an integer number (10210123224).

Almost surely, 2^209618104971 is an apocalyptic number.

209618104971 is a deficient number, since it is larger than the sum of its proper divisors (117105838197).

209618104971 is a wasteful number, since it uses less digits than its factorization.

209618104971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501931.

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 209618104971 in words is "two hundred nine billion, six hundred eighteen million, one hundred four thousand, nine hundred seventy-one".