856161 has 12 divisors (see below), whose sum is σ = 1244880. Its totient is φ = 567000.

The previous prime is 856153. The next prime is 856169. The reversal of 856161 is 161658.

It is an interprime number because it is at equal distance from previous prime (856153) and next prime (856169).

It is not a de Polignac number, because 856161 - 2³ = 856153 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (856169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2070 + ... + 2448.

It is an arithmetic number, because the mean of its divisors is an integer number (103740).

2⁸⁵⁶¹⁶¹ is an apocalyptic number.

It is an amenable number.

856161 is a deficient number, since it is larger than the sum of its proper divisors (388719).

856161 is a wasteful number, since it uses less digits than its factorization.

856161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 633 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 856161 is about 925.2896843692. The cubic root of 856161 is about 94.9551404085.

It can be divided in two parts, 8 and 56161, that added together give a square (56169 = 237²).

The spelling of 856161 in words is "eight hundred fifty-six thousand, one hundred sixty-one".