971857 has 2 divisors, whose sum is σ = 971858. Its totient is φ = 971856.

The previous prime is 971851. The next prime is 971863. The reversal of 971857 is 758179.

971857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (971851) and next prime (971863).

It can be written as a sum of positive squares in only one way, i.e., 732736 + 239121 = 856^2 + 489^2 .

It is an emirp because it is prime and its reverse (758179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971857 - 2¹¹ = 969809 is a prime.

It is not a weakly prime, because it can be changed into another prime (971851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485928 + 485929.

It is an arithmetic number, because the mean of its divisors is an integer number (485929).

2⁹⁷¹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

971857 is a deficient number, since it is larger than the sum of its proper divisors (1).

971857 is an equidigital number, since it uses as much as digits as its factorization.

971857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 971857 is about 985.8280783179. The cubic root of 971857 is about 99.0529594550.

The spelling of 971857 in words is "nine hundred seventy-one thousand, eight hundred fifty-seven".