865601 has 4 divisors (see below), whose sum is σ = 944304. Its totient is φ = 786900.

The previous prime is 865597. The next prime is 865609. The reversal of 865601 is 106568.

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 865601 - 2² = 865597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865609) 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, 39335 + ... + 39356.

It is an arithmetic number, because the mean of its divisors is an integer number (236076).

2⁸⁶⁵⁶⁰¹ is an apocalyptic number.

It is an amenable number.

865601 is a deficient number, since it is larger than the sum of its proper divisors (78703).

865601 is a wasteful number, since it uses less digits than its factorization.

865601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78702.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 865601 is about 930.3768053859. The cubic root of 865601 is about 95.3028561953.

The spelling of 865601 in words is "eight hundred sixty-five thousand, six hundred one".