172911709211 has 2 divisors, whose sum is σ = 172911709212. Its totient is φ = 172911709210.

The previous prime is 172911709189. The next prime is 172911709213. The reversal of 172911709211 is 112907119271.

It is a strong prime.

It is an emirp because it is prime and its reverse (112907119271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172911709211 - 2⁶ = 172911709147 is a prime.

Together with 172911709213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172911709213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86455854605 + 86455854606.

It is an arithmetic number, because the mean of its divisors is an integer number (86455854606).

Almost surely, 2^172911709211 is an apocalyptic number.

172911709211 is a deficient number, since it is larger than the sum of its proper divisors (1).

172911709211 is an equidigital number, since it uses as much as digits as its factorization.

172911709211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 41.

The spelling of 172911709211 in words is "one hundred seventy-two billion, nine hundred eleven million, seven hundred nine thousand, two hundred eleven".