856459841 has 2 divisors, whose sum is σ = 856459842. Its totient is φ = 856459840.

The previous prime is 856459829. The next prime is 856459843. The reversal of 856459841 is 148954658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571018816 + 285441025 = 23896^2 + 16895^2 .

It is a cyclic number.

It is not a de Polignac number, because 856459841 - 2²⁶ = 789350977 is a prime.

Together with 856459843, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856459841.

It is not a weakly prime, because it can be changed into another prime (856459843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428229920 + 428229921.

It is an arithmetic number, because the mean of its divisors is an integer number (428229921).

Almost surely, 2^856459841 is an apocalyptic number.

It is an amenable number.

856459841 is a deficient number, since it is larger than the sum of its proper divisors (1).

856459841 is an equidigital number, since it uses as much as digits as its factorization.

856459841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 50.

The square root of 856459841 is about 29265.3351424514. The cubic root of 856459841 is about 949.6618708012.

The spelling of 856459841 in words is "eight hundred fifty-six million, four hundred fifty-nine thousand, eight hundred forty-one".