171000857 has 2 divisors, whose sum is σ = 171000858. Its totient is φ = 171000856.

The previous prime is 171000847. The next prime is 171000859. The reversal of 171000857 is 758000171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138556441 + 32444416 = 11771^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 171000857 - 2²² = 166806553 is a prime.

Together with 171000859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171000859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85500428 + 85500429.

It is an arithmetic number, because the mean of its divisors is an integer number (85500429).

Almost surely, 2^171000857 is an apocalyptic number.

It is an amenable number.

171000857 is a deficient number, since it is larger than the sum of its proper divisors (1).

171000857 is an equidigital number, since it uses as much as digits as its factorization.

171000857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 29.

The square root of 171000857 is about 13076.7295987950. The cubic root of 171000857 is about 555.0508375367.

The spelling of 171000857 in words is "one hundred seventy-one million, eight hundred fifty-seven", and thus it is an aban number.