856341121 has 2 divisors, whose sum is σ = 856341122. Its totient is φ = 856341120.

The previous prime is 856341113. The next prime is 856341127. The reversal of 856341121 is 121143658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559984896 + 296356225 = 23664^2 + 17215^2 .

It is a cyclic number.

It is not a de Polignac number, because 856341121 - 2³ = 856341113 is a prime.

It is equal to p_43890241 and since 856341121 and 43890241 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 (856341127) 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, 428170560 + 428170561.

It is an arithmetic number, because the mean of its divisors is an integer number (428170561).

Almost surely, 2^856341121 is an apocalyptic number.

It is an amenable number.

856341121 is a deficient number, since it is larger than the sum of its proper divisors (1).

856341121 is an equidigital number, since it uses as much as digits as its factorization.

856341121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 856341121 is about 29263.3067338604. The cubic root of 856341121 is about 949.6179889745.

Adding to 856341121 its reverse (121143658), we get a palindrome (977484779).

The spelling of 856341121 in words is "eight hundred fifty-six million, three hundred forty-one thousand, one hundred twenty-one".