172911709209 has 16 divisors (see below), whose sum is σ = 232254176000. Its totient is φ = 114422191056.

The previous prime is 172911709189. The next prime is 172911709211. The reversal of 172911709209 is 902907119271.

It is a de Polignac number, because none of the positive numbers 2^k-172911709209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172911709609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2180742 + ... + 2258640.

It is an arithmetic number, because the mean of its divisors is an integer number (14515886000).

Almost surely, 2^172911709209 is an apocalyptic number.

It is an amenable number.

172911709209 is a deficient number, since it is larger than the sum of its proper divisors (59342466791).

172911709209 is a wasteful number, since it uses less digits than its factorization.

172911709209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83364.

The product of its (nonzero) digits is 142884, while the sum is 48.

The spelling of 172911709209 in words is "one hundred seventy-two billion, nine hundred eleven million, seven hundred nine thousand, two hundred nine".