857291161 has 2 divisors, whose sum is σ = 857291162. Its totient is φ = 857291160.

The previous prime is 857291159. The next prime is 857291177. The reversal of 857291161 is 161192758.

It is a happy number.

857291161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645414025 + 211877136 = 25405^2 + 14556^2 .

It is a cyclic number.

It is not a de Polignac number, because 857291161 - 2¹ = 857291159 is a prime.

Together with 857291159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (857295161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428645580 + 428645581.

It is an arithmetic number, because the mean of its divisors is an integer number (428645581).

Almost surely, 2^857291161 is an apocalyptic number.

It is an amenable number.

857291161 is a deficient number, since it is larger than the sum of its proper divisors (1).

857291161 is an equidigital number, since it uses as much as digits as its factorization.

857291161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 857291161 is about 29279.5348494473. The cubic root of 857291161 is about 949.9690335243.

The spelling of 857291161 in words is "eight hundred fifty-seven million, two hundred ninety-one thousand, one hundred sixty-one".