813723321 has 4 divisors (see below), whose sum is σ = 1084964432. Its totient is φ = 542482212.

The previous prime is 813723301. The next prime is 813723341. The reversal of 813723321 is 123327318.

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 an interprime number because it is at equal distance from previous prime (813723301) and next prime (813723341).

It is not a de Polignac number, because 813723321 - 2⁵ = 813723289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (813723301) 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, 135620551 + ... + 135620556.

It is an arithmetic number, because the mean of its divisors is an integer number (271241108).

Almost surely, 2^813723321 is an apocalyptic number.

It is an amenable number.

813723321 is a deficient number, since it is larger than the sum of its proper divisors (271241111).

813723321 is a wasteful number, since it uses less digits than its factorization.

813723321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271241110.

The product of its digits is 6048, while the sum is 30.

The square root of 813723321 is about 28525.8360263113. The cubic root of 813723321 is about 933.5958681380.

The spelling of 813723321 in words is "eight hundred thirteen million, seven hundred twenty-three thousand, three hundred twenty-one".