865486881 has 24 divisors (see below), whose sum is σ = 1512785664. Its totient is φ = 465471360.

The previous prime is 865486837. The next prime is 865486883. The reversal of 865486881 is 188684568.

865486881 is a `hidden beast` number, since 86 + 5 + 486 + 8 + 81 = 666.

It is not a de Polignac number, because 865486881 - 2¹⁰ = 865485857 is a prime.

It is a super-2 number, since 2×865486881² = 1498135082366216322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865486883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402985 + ... + 405126.

It is an arithmetic number, because the mean of its divisors is an integer number (63032736).

Almost surely, 2^865486881 is an apocalyptic number.

It is an amenable number.

865486881 is a deficient number, since it is larger than the sum of its proper divisors (647298783).

865486881 is a wasteful number, since it uses less digits than its factorization.

865486881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808141 (or 808138 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 865486881 is about 29419.1584006069. The cubic root of 865486881 is about 952.9866783573.

The spelling of 865486881 in words is "eight hundred sixty-five million, four hundred eighty-six thousand, eight hundred eighty-one".