8128313 has 4 divisors (see below), whose sum is σ = 8136228. Its totient is φ = 8120400.

The previous prime is 8128259. The next prime is 8128319. The reversal of 8128313 is 3138218.

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 1507984 + 6620329 = 1228^2 + 2573^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128313 - 2⁶ = 8128249 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 (8128319) 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, 2138 + ... + 4563.

It is an arithmetic number, because the mean of its divisors is an integer number (2034057).

Almost surely, 2^8128313 is an apocalyptic number.

It is an amenable number.

8128313 is a deficient number, since it is larger than the sum of its proper divisors (7915).

8128313 is a wasteful number, since it uses less digits than its factorization.

8128313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7914.

The product of its digits is 1152, while the sum is 26.

The square root of 8128313 is about 2851.0196421631. The cubic root of 8128313 is about 201.0636086563.

The spelling of 8128313 in words is "eight million, one hundred twenty-eight thousand, three hundred thirteen".