171256871 has 2 divisors, whose sum is σ = 171256872. Its totient is φ = 171256870.

The previous prime is 171256859. The next prime is 171256901. The reversal of 171256871 is 178652171.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171256871 - 2⁶ = 171256807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171256171) 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, 85628435 + 85628436.

It is an arithmetic number, because the mean of its divisors is an integer number (85628436).

Almost surely, 2^171256871 is an apocalyptic number.

171256871 is a deficient number, since it is larger than the sum of its proper divisors (1).

171256871 is an equidigital number, since it uses as much as digits as its factorization.

171256871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 38.

The square root of 171256871 is about 13086.5148530845. The cubic root of 171256871 is about 555.3276976085.

The spelling of 171256871 in words is "one hundred seventy-one million, two hundred fifty-six thousand, eight hundred seventy-one".