856049641 has 2 divisors, whose sum is σ = 856049642. Its totient is φ = 856049640.

The previous prime is 856049591. The next prime is 856049651. The reversal of 856049641 is 146940658.

856049641 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., 784224016 + 71825625 = 28004^2 + 8475^2 .

It is a cyclic number.

It is not a de Polignac number, because 856049641 - 2¹³ = 856041449 is a prime.

It is equal to p_43876177 and since 856049641 and 43876177 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (856049651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428024820 + 428024821.

It is an arithmetic number, because the mean of its divisors is an integer number (428024821).

Almost surely, 2^856049641 is an apocalyptic number.

It is an amenable number.

856049641 is a deficient number, since it is larger than the sum of its proper divisors (1).

856049641 is an equidigital number, since it uses as much as digits as its factorization.

856049641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 856049641 is about 29258.3260115817. The cubic root of 856049641 is about 949.5102336047.

The spelling of 856049641 in words is "eight hundred fifty-six million, forty-nine thousand, six hundred forty-one".