865225321 has 4 divisors (see below), whose sum is σ = 865511044. Its totient is φ = 864939600.

The previous prime is 865225313. The next prime is 865225327. The reversal of 865225321 is 123522568.

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 679175721 + 186049600 = 26061^2 + 13640^2 .

It is a cyclic number.

It is not a de Polignac number, because 865225321 - 2³ = 865225313 is a prime.

It is a super-2 number, since 2×865225321² = 1497229712199106082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865225327) 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, 138270 + ... + 144391.

It is an arithmetic number, because the mean of its divisors is an integer number (216377761).

Almost surely, 2^865225321 is an apocalyptic number.

It is an amenable number.

865225321 is a deficient number, since it is larger than the sum of its proper divisors (285723).

865225321 is a wasteful number, since it uses less digits than its factorization.

865225321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285722.

The product of its digits is 28800, while the sum is 34.

The square root of 865225321 is about 29414.7126622036. The cubic root of 865225321 is about 952.8906675394.

Adding to 865225321 its reverse (123522568), we get a palindrome (988747889).

The spelling of 865225321 in words is "eight hundred sixty-five million, two hundred twenty-five thousand, three hundred twenty-one".