857085841 has 2 divisors, whose sum is σ = 857085842. Its totient is φ = 857085840.

The previous prime is 857085809. The next prime is 857085881. The reversal of 857085841 is 148580758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435974400 + 421111441 = 20880^2 + 20521^2 .

It is a cyclic number.

It is not a de Polignac number, because 857085841 - 2⁵ = 857085809 is a prime.

It is a super-2 number, since 2×857085841² = 1469192277685354562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 857085791 and 857085800.

It is not a weakly prime, because it can be changed into another prime (857085881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428542920 + 428542921.

It is an arithmetic number, because the mean of its divisors is an integer number (428542921).

Almost surely, 2^857085841 is an apocalyptic number.

It is an amenable number.

857085841 is a deficient number, since it is larger than the sum of its proper divisors (1).

857085841 is an equidigital number, since it uses as much as digits as its factorization.

857085841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 358400, while the sum is 46.

The square root of 857085841 is about 29276.0284362480. The cubic root of 857085841 is about 949.8931887300.

The spelling of 857085841 in words is "eight hundred fifty-seven million, eighty-five thousand, eight hundred forty-one".