171257012869 has 2 divisors, whose sum is σ = 171257012870. Its totient is φ = 171257012868.

The previous prime is 171257012851. The next prime is 171257012879. The reversal of 171257012869 is 968210752171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156044750625 + 15212262244 = 395025^2 + 123338^2 .

It is a cyclic number.

It is not a de Polignac number, because 171257012869 - 2²⁹ = 170720141957 is a prime.

It is a super-2 number, since 2×171257012869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171257012809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85628506434 + 85628506435.

It is an arithmetic number, because the mean of its divisors is an integer number (85628506435).

Almost surely, 2^171257012869 is an apocalyptic number.

It is an amenable number.

171257012869 is a deficient number, since it is larger than the sum of its proper divisors (1).

171257012869 is an equidigital number, since it uses as much as digits as its factorization.

171257012869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 171257012869 in words is "one hundred seventy-one billion, two hundred fifty-seven million, twelve thousand, eight hundred sixty-nine".