1313530321 has 4 divisors (see below), whose sum is σ = 1358824500. Its totient is φ = 1268236144.

The previous prime is 1313530307. The next prime is 1313530349. The reversal of 1313530321 is 1230353131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 672883600 + 640646721 = 25940^2 + 25311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313530321 - 2⁹ = 1313529809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313530292 and 1313530301.

It is not an unprimeable number, because it can be changed into a prime (1313536321) 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, 22647046 + ... + 22647103.

It is an arithmetic number, because the mean of its divisors is an integer number (339706125).

Almost surely, 2^1313530321 is an apocalyptic number.

It is an amenable number.

1313530321 is a deficient number, since it is larger than the sum of its proper divisors (45294179).

1313530321 is an equidigital number, since it uses as much as digits as its factorization.

1313530321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45294178.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 1313530321 is about 36242.6588566568. The cubic root of 1313530321 is about 1095.1662059449.

Adding to 1313530321 its reverse (1230353131), we get a palindrome (2543883452).

The spelling of 1313530321 in words is "one billion, three hundred thirteen million, five hundred thirty thousand, three hundred twenty-one".