856181 has 2 divisors, whose sum is σ = 856182. Its totient is φ = 856180.

The previous prime is 856169. The next prime is 856187. The reversal of 856181 is 181658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 167281 = 830^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 856181 - 2⁶ = 856117 is a prime.

It is a super-2 number, since 2×856181² = 1466091809522, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856181.

It is not a weakly prime, because it can be changed into another prime (856187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428090 + 428091.

It is an arithmetic number, because the mean of its divisors is an integer number (428091).

2⁸⁵⁶¹⁸¹ is an apocalyptic number.

It is an amenable number.

856181 is a deficient number, since it is larger than the sum of its proper divisors (1).

856181 is an equidigital number, since it uses as much as digits as its factorization.

856181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 856181 is about 925.3004917323. The cubic root of 856181 is about 94.9558797897.

The spelling of 856181 in words is "eight hundred fifty-six thousand, one hundred eighty-one".