856866341 has 2 divisors, whose sum is σ = 856866342. Its totient is φ = 856866340.

The previous prime is 856866287. The next prime is 856866343. The reversal of 856866341 is 143668658.

856866341 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523036900 + 333829441 = 22870^2 + 18271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856866341 is a prime.

Together with 856866343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856866343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428433170 + 428433171.

It is an arithmetic number, because the mean of its divisors is an integer number (428433171).

Almost surely, 2^856866341 is an apocalyptic number.

It is an amenable number.

856866341 is a deficient number, since it is larger than the sum of its proper divisors (1).

856866341 is an equidigital number, since it uses as much as digits as its factorization.

856866341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 47.

The square root of 856866341 is about 29272.2793953597. The cubic root of 856866341 is about 949.8120924747.

The spelling of 856866341 in words is "eight hundred fifty-six million, eight hundred sixty-six thousand, three hundred forty-one".