805168321 has 4 divisors (see below), whose sum is σ = 805254532. Its totient is φ = 805082112.

The previous prime is 805168307. The next prime is 805168333. The reversal of 805168321 is 123861508.

805168321 = 20064² + 20065².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 402604225 + 402564096 = 20065^2 + 20064^2 .

It is a cyclic number.

It is not a de Polignac number, because 805168321 - 2¹¹ = 805166273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805168361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27120 + ... + 48433.

It is an arithmetic number, because the mean of its divisors is an integer number (201313633).

Almost surely, 2^805168321 is an apocalyptic number.

805168321 is the 20065-th centered square number.

It is an amenable number.

805168321 is a deficient number, since it is larger than the sum of its proper divisors (86211).

805168321 is a wasteful number, since it uses less digits than its factorization.

805168321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86210.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 805168321 is about 28375.4880310454. The cubic root of 805168321 is about 930.3125788611.

The spelling of 805168321 in words is "eight hundred five million, one hundred sixty-eight thousand, three hundred twenty-one".