871657 has 2 divisors, whose sum is σ = 871658. Its totient is φ = 871656.

The previous prime is 871649. The next prime is 871679. The reversal of 871657 is 756178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724201 + 147456 = 851^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 871657 - 2³ = 871649 is a prime.

It is not a weakly prime, because it can be changed into another prime (871687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435828 + 435829.

It is an arithmetic number, because the mean of its divisors is an integer number (435829).

2⁸⁷¹⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

871657 is a deficient number, since it is larger than the sum of its proper divisors (1).

871657 is an equidigital number, since it uses as much as digits as its factorization.

871657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 871657 is about 933.6257280088. The cubic root of 871657 is about 95.5245955126.

The spelling of 871657 in words is "eight hundred seventy-one thousand, six hundred fifty-seven".