856755169 has 2 divisors, whose sum is σ = 856755170. Its totient is φ = 856755168.

The previous prime is 856755143. The next prime is 856755199. The reversal of 856755169 is 961557658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835961569 + 20793600 = 28913^2 + 4560^2 .

It is a cyclic number.

It is not a de Polignac number, because 856755169 - 2¹⁵ = 856722401 is a prime.

It is a super-2 number, since 2×856755169² = 1468058839216437122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856755199) 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, 428377584 + 428377585.

It is an arithmetic number, because the mean of its divisors is an integer number (428377585).

Almost surely, 2^856755169 is an apocalyptic number.

It is an amenable number.

856755169 is a deficient number, since it is larger than the sum of its proper divisors (1).

856755169 is an equidigital number, since it uses as much as digits as its factorization.

856755169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268000, while the sum is 52.

The square root of 856755169 is about 29270.3804040877. The cubic root of 856755169 is about 949.7710136927.

It can be divided in two parts, 8567 and 55169, that added together give a palindrome (63736).

The spelling of 856755169 in words is "eight hundred fifty-six million, seven hundred fifty-five thousand, one hundred sixty-nine".