865081 has 4 divisors (see below), whose sum is σ = 988672. Its totient is φ = 741492.

The previous prime is 865069. The next prime is 865087. The reversal of 865081 is 180568.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865081 - 2⁵ = 865049 is a prime.

It is a super-2 number, since 2×865081² = 1496730273122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61785 + ... + 61798.

It is an arithmetic number, because the mean of its divisors is an integer number (247168).

2⁸⁶⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

865081 is a deficient number, since it is larger than the sum of its proper divisors (123591).

865081 is a wasteful number, since it uses less digits than its factorization.

865081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123590.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 865081 is about 930.0973067373. The cubic root of 865081 is about 95.2837683352.

The spelling of 865081 in words is "eight hundred sixty-five thousand, eighty-one".