856215161 has 2 divisors, whose sum is σ = 856215162. Its totient is φ = 856215160.

The previous prime is 856215137. The next prime is 856215163. The reversal of 856215161 is 161512658.

It is a happy number.

856215161 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., 772840000 + 83375161 = 27800^2 + 9131^2 .

It is a cyclic number.

It is not a de Polignac number, because 856215161 - 2¹⁸ = 855953017 is a prime.

Together with 856215163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856215163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428107580 + 428107581.

It is an arithmetic number, because the mean of its divisors is an integer number (428107581).

Almost surely, 2^856215161 is an apocalyptic number.

It is an amenable number.

856215161 is a deficient number, since it is larger than the sum of its proper divisors (1).

856215161 is an equidigital number, since it uses as much as digits as its factorization.

856215161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 856215161 is about 29261.1544714148. The cubic root of 856215161 is about 949.5714266314.

The spelling of 856215161 in words is "eight hundred fifty-six million, two hundred fifteen thousand, one hundred sixty-one".