172911709609 has 2 divisors, whose sum is σ = 172911709610. Its totient is φ = 172911709608.

The previous prime is 172911709583. The next prime is 172911709667. The reversal of 172911709609 is 906907119271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95629377600 + 77282332009 = 309240^2 + 277997^2 .

It is an emirp because it is prime and its reverse (906907119271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172911709609 - 2⁵ = 172911709577 is a prime.

It is not a weakly prime, because it can be changed into another prime (172911709699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86455854804 + 86455854805.

It is an arithmetic number, because the mean of its divisors is an integer number (86455854805).

Almost surely, 2^172911709609 is an apocalyptic number.

It is an amenable number.

172911709609 is a deficient number, since it is larger than the sum of its proper divisors (1).

172911709609 is an equidigital number, since it uses as much as digits as its factorization.

172911709609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 428652, while the sum is 52.

The spelling of 172911709609 in words is "one hundred seventy-two billion, nine hundred eleven million, seven hundred nine thousand, six hundred nine".