810609321 has 4 divisors (see below), whose sum is σ = 1080812432. Its totient is φ = 540406212.

The previous prime is 810609313. The next prime is 810609323. The reversal of 810609321 is 123906018.

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 not a de Polignac number, because 810609321 - 2³ = 810609313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810609323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135101551 + ... + 135101556.

It is an arithmetic number, because the mean of its divisors is an integer number (270203108).

Almost surely, 2^810609321 is an apocalyptic number.

It is an amenable number.

810609321 is a deficient number, since it is larger than the sum of its proper divisors (270203111).

810609321 is a wasteful number, since it uses less digits than its factorization.

810609321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270203110.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 810609321 is about 28471.2016079406. The cubic root of 810609321 is about 932.4034341901.

The spelling of 810609321 in words is "eight hundred ten million, six hundred nine thousand, three hundred twenty-one".