1313304521 has 4 divisors (see below), whose sum is σ = 1314007572. Its totient is φ = 1312601472.

The previous prime is 1313304481. The next prime is 1313304569. The reversal of 1313304521 is 1254033131.

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 529920400 + 783384121 = 23020^2 + 27989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313304521 - 2⁶ = 1313304457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313304571) 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, 348716 + ... + 352461.

It is an arithmetic number, because the mean of its divisors is an integer number (328501893).

Almost surely, 2^1313304521 is an apocalyptic number.

It is an amenable number.

1313304521 is a deficient number, since it is larger than the sum of its proper divisors (703051).

1313304521 is an equidigital number, since it uses as much as digits as its factorization.

1313304521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703050.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1313304521 is about 36239.5436091571. The cubic root of 1313304521 is about 1095.1034481751.

Adding to 1313304521 its reverse (1254033131), we get a palindrome (2567337652).

The spelling of 1313304521 in words is "one billion, three hundred thirteen million, three hundred four thousand, five hundred twenty-one".