857161 has 2 divisors, whose sum is σ = 857162. Its totient is φ = 857160.

The previous prime is 857137. The next prime is 857167. The reversal of 857161 is 161758.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447561 + 409600 = 669^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 857161 - 2⁹ = 856649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428580 + 428581.

It is an arithmetic number, because the mean of its divisors is an integer number (428581).

2⁸⁵⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

857161 is a deficient number, since it is larger than the sum of its proper divisors (1).

857161 is an equidigital number, since it uses as much as digits as its factorization.

857161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 857161 is about 925.8298979834. The cubic root of 857161 is about 94.9920953718.

The spelling of 857161 in words is "eight hundred fifty-seven thousand, one hundred sixty-one".