1315882321 has 4 divisors (see below), whose sum is σ = 1417104052. Its totient is φ = 1214660592.

The previous prime is 1315882291. The next prime is 1315882339. The reversal of 1315882321 is 1232885131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1232885131 = 727 ⋅1695853.

It can be written as a sum of positive squares in 2 ways, for example, as 647142721 + 668739600 = 25439^2 + 25860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315882321 - 2⁷ = 1315882193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1315882391) 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, 50610846 + ... + 50610871.

It is an arithmetic number, because the mean of its divisors is an integer number (354276013).

Almost surely, 2^1315882321 is an apocalyptic number.

It is an amenable number.

1315882321 is a deficient number, since it is larger than the sum of its proper divisors (101221731).

1315882321 is a wasteful number, since it uses less digits than its factorization.

1315882321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101221730.

The product of its digits is 11520, while the sum is 34.

The square root of 1315882321 is about 36275.0922948516. The cubic root of 1315882321 is about 1095.8194823304.

The spelling of 1315882321 in words is "one billion, three hundred fifteen million, eight hundred eighty-two thousand, three hundred twenty-one".