8121313 has 4 divisors (see below), whose sum is σ = 8135428. Its totient is φ = 8107200.

The previous prime is 8121307. The next prime is 8121319. The reversal of 8121313 is 3131218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3131218 = 2 ⋅1565609.

It is an interprime number because it is at equal distance from previous prime (8121307) and next prime (8121319).

It can be written as a sum of positive squares in 2 ways, for example, as 5650129 + 2471184 = 2377^2 + 1572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121313 is a prime.

It is a Duffinian number.

8121313 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8121319) 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, 6156 + ... + 7357.

It is an arithmetic number, because the mean of its divisors is an integer number (2033857).

Almost surely, 2^8121313 is an apocalyptic number.

It is an amenable number.

8121313 is a deficient number, since it is larger than the sum of its proper divisors (14115).

8121313 is a wasteful number, since it uses less digits than its factorization.

8121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14114.

The product of its digits is 144, while the sum is 19.

The square root of 8121313 is about 2849.7917467773. The cubic root of 8121313 is about 201.0058742704.

The spelling of 8121313 in words is "eight million, one hundred twenty-one thousand, three hundred thirteen".