815325115231321 has 8 divisors (see below), whose sum is σ = 815790763229288. Its totient is φ = 814859481600000.

The previous prime is 815325115231217. The next prime is 815325115231411. The reversal of 815325115231321 is 123132511523518.

It can be written as a sum of positive squares in 4 ways, for example, as 383760264040000 + 431564851191321 = 19589800^2 + 20774139^2 .

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 815325115231321 - 2³³ = 815316525296729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815325115231421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110986441 + ... + 118104361.

It is an arithmetic number, because the mean of its divisors is an integer number (101973845403661).

Almost surely, 2^{815325115231321} is an apocalyptic number.

It is an amenable number.

815325115231321 is a deficient number, since it is larger than the sum of its proper divisors (465647997967).

815325115231321 is a wasteful number, since it uses less digits than its factorization.

815325115231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183323.

The product of its digits is 216000, while the sum is 43.

Adding to 815325115231321 its reverse (123132511523518), we get a palindrome (938457626754839).

The spelling of 815325115231321 in words is "eight hundred fifteen trillion, three hundred twenty-five billion, one hundred fifteen million, two hundred thirty-one thousand, three hundred twenty-one".