1313436521 has 4 divisors (see below), whose sum is σ = 1320313344. Its totient is φ = 1306559700.

The previous prime is 1313436511. The next prime is 1313436539. The reversal of 1313436521 is 1256343131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1256343131 = 26263 ⋅47837.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313436521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313436511) 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, 3438125 + ... + 3438506.

It is an arithmetic number, because the mean of its divisors is an integer number (330078336).

Almost surely, 2^1313436521 is an apocalyptic number.

It is an amenable number.

1313436521 is a deficient number, since it is larger than the sum of its proper divisors (6876823).

1313436521 is an equidigital number, since it uses as much as digits as its factorization.

1313436521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876822.

The product of its digits is 6480, while the sum is 29.

The square root of 1313436521 is about 36241.3647783855. The cubic root of 1313436521 is about 1095.1401364958.

Adding to 1313436521 its reverse (1256343131), we get a palindrome (2569779652).

The spelling of 1313436521 in words is "one billion, three hundred thirteen million, four hundred thirty-six thousand, five hundred twenty-one".