1315443521 has 16 divisors (see below), whose sum is σ = 1518206976. Its totient is φ = 1116427536.

The previous prime is 1315443427. The next prime is 1315443523. The reversal of 1315443521 is 1253445131.

It is not a de Polignac number, because 1315443521 - 2¹⁰ = 1315442497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315443523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574040 + ... + 576326.

It is an arithmetic number, because the mean of its divisors is an integer number (94887936).

Almost surely, 2^1315443521 is an apocalyptic number.

It is an amenable number.

1315443521 is a deficient number, since it is larger than the sum of its proper divisors (202763455).

1315443521 is a wasteful number, since it uses less digits than its factorization.

1315443521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068.

The product of its digits is 7200, while the sum is 29.

The square root of 1315443521 is about 36269.0435633475. The cubic root of 1315443521 is about 1095.6976631679.

Adding to 1315443521 its reverse (1253445131), we get a palindrome (2568888652).

The spelling of 1315443521 in words is "one billion, three hundred fifteen million, four hundred forty-three thousand, five hundred twenty-one".