855881 has 4 divisors (see below), whose sum is σ = 921732. Its totient is φ = 790032.

The previous prime is 855863. The next prime is 855887. The reversal of 855881 is 188558.

855881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116281 + 739600 = 341^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 855881 - 2¹⁴ = 839497 is a prime.

It is a super-2 number, since 2×855881² = 1465064572322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 855881.

It is not an unprimeable number, because it can be changed into a prime (855887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32906 + ... + 32931.

It is an arithmetic number, because the mean of its divisors is an integer number (230433).

2⁸⁵⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

855881 is a deficient number, since it is larger than the sum of its proper divisors (65851).

855881 is a wasteful number, since it uses less digits than its factorization.

855881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65850.

The product of its digits is 12800, while the sum is 35.

The square root of 855881 is about 925.1383680293. The cubic root of 855881 is about 94.9447878626.

The spelling of 855881 in words is "eight hundred fifty-five thousand, eight hundred eighty-one".