171205171289 has 2 divisors, whose sum is σ = 171205171290. Its totient is φ = 171205171288.

The previous prime is 171205171237. The next prime is 171205171297. The reversal of 171205171289 is 982171502171.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170162850064 + 1042321225 = 412508^2 + 32285^2 .

It is a cyclic number.

It is not a de Polignac number, because 171205171289 - 2²⁴ = 171188394073 is a prime.

It is a super-2 number, since 2×171205171289² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171205177289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85602585644 + 85602585645.

It is an arithmetic number, because the mean of its divisors is an integer number (85602585645).

Almost surely, 2^171205171289 is an apocalyptic number.

It is an amenable number.

171205171289 is a deficient number, since it is larger than the sum of its proper divisors (1).

171205171289 is an equidigital number, since it uses as much as digits as its factorization.

171205171289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 44.

The spelling of 171205171289 in words is "one hundred seventy-one billion, two hundred five million, one hundred seventy-one thousand, two hundred eighty-nine".