171838538717 has 2 divisors, whose sum is σ = 171838538718. Its totient is φ = 171838538716.

The previous prime is 171838538671. The next prime is 171838538759. The reversal of 171838538717 is 717835838171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167652578116 + 4185960601 = 409454^2 + 64699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171838538717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171838538917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85919269358 + 85919269359.

It is an arithmetic number, because the mean of its divisors is an integer number (85919269359).

Almost surely, 2^171838538717 is an apocalyptic number.

It is an amenable number.

171838538717 is a deficient number, since it is larger than the sum of its proper divisors (1).

171838538717 is an equidigital number, since it uses as much as digits as its factorization.

171838538717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 59.

The spelling of 171838538717 in words is "one hundred seventy-one billion, eight hundred thirty-eight million, five hundred thirty-eight thousand, seven hundred seventeen".