7815973313 has 8 divisors (see below), whose sum is σ = 7867128360. Its totient is φ = 7764906240.

The previous prime is 7815973259. The next prime is 7815973339. The reversal of 7815973313 is 3133795187.

It can be written as a sum of positive squares in 4 ways, for example, as 494261824 + 7321711489 = 22232^2 + 85567^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7815973313 - 2²⁸ = 7547537857 is a prime.

It is a super-2 number, since 2×7815973313² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7815973343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161231 + ... + 204027.

It is an arithmetic number, because the mean of its divisors is an integer number (983391045).

Almost surely, 2^7815973313 is an apocalyptic number.

It is an amenable number.

7815973313 is a deficient number, since it is larger than the sum of its proper divisors (51155047).

7815973313 is a wasteful number, since it uses less digits than its factorization.

7815973313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43987.

The product of its digits is 476280, while the sum is 47.

The square root of 7815973313 is about 88407.9934904079. The cubic root of 7815973313 is about 1984.5453268981.

The spelling of 7815973313 in words is "seven billion, eight hundred fifteen million, nine hundred seventy-three thousand, three hundred thirteen".