865411321 has 4 divisors (see below), whose sum is σ = 866725200. Its totient is φ = 864097444.

The previous prime is 865411289. The next prime is 865411343. The reversal of 865411321 is 123114568.

865411321 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, 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 865411321 - 2⁵ = 865411289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865411361) 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, 655951 + ... + 657268.

It is an arithmetic number, because the mean of its divisors is an integer number (216681300).

Almost surely, 2^865411321 is an apocalyptic number.

It is an amenable number.

865411321 is a deficient number, since it is larger than the sum of its proper divisors (1313879).

865411321 is a wasteful number, since it uses less digits than its factorization.

865411321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313878.

The product of its digits is 5760, while the sum is 31.

The square root of 865411321 is about 29417.8741754057. The cubic root of 865411321 is about 952.9589445385.

Adding to 865411321 its reverse (123114568), we get a palindrome (988525889).

The spelling of 865411321 in words is "eight hundred sixty-five million, four hundred eleven thousand, three hundred twenty-one".