856215361 has 2 divisors, whose sum is σ = 856215362. Its totient is φ = 856215360.

The previous prime is 856215317. The next prime is 856215377. The reversal of 856215361 is 163512658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850305600 + 5909761 = 29160^2 + 2431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856215361 is a prime.

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 856215361.

It is not a weakly prime, because it can be changed into another prime (856215161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428107680 + 428107681.

It is an arithmetic number, because the mean of its divisors is an integer number (428107681).

Almost surely, 2^856215361 is an apocalyptic number.

It is an amenable number.

856215361 is a deficient number, since it is larger than the sum of its proper divisors (1).

856215361 is an equidigital number, since it uses as much as digits as its factorization.

856215361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 856215361 is about 29261.1578889148. The cubic root of 856215361 is about 949.5715005670.

The spelling of 856215361 in words is "eight hundred fifty-six million, two hundred fifteen thousand, three hundred sixty-one".