857081 has 2 divisors, whose sum is σ = 857082. Its totient is φ = 857080.

The previous prime is 857069. The next prime is 857083. The reversal of 857081 is 180758.

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., 781456 + 75625 = 884^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 857081 - 2¹⁰ = 856057 is a prime.

It is a super-2 number, since 2×857081² = 1469175681122, which contains 22 as substring.

Together with 857083, 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 (857083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428540 + 428541.

It is an arithmetic number, because the mean of its divisors is an integer number (428541).

2⁸⁵⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

857081 is a deficient number, since it is larger than the sum of its proper divisors (1).

857081 is an equidigital number, since it uses as much as digits as its factorization.

857081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 857081 is about 925.7866924946. The cubic root of 857081 is about 94.9891400328.

The spelling of 857081 in words is "eight hundred fifty-seven thousand, eighty-one".