1317328521 has 16 divisors (see below), whose sum is σ = 1903011264. Its totient is φ = 807335424.

The previous prime is 1317328511. The next prime is 1317328531. The reversal of 1317328521 is 1258237131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1317328511) and next prime (1317328531).

It is not a de Polignac number, because 1317328521 - 2¹⁴ = 1317312137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1317328511) 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, 298156 + ... + 302541.

It is an arithmetic number, because the mean of its divisors is an integer number (118938204).

Almost surely, 2^1317328521 is an apocalyptic number.

It is an amenable number.

1317328521 is a deficient number, since it is larger than the sum of its proper divisors (585682743).

1317328521 is a wasteful number, since it uses less digits than its factorization.

1317328521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600760.

The product of its digits is 10080, while the sum is 33.

The square root of 1317328521 is about 36295.0206088934. The cubic root of 1317328521 is about 1096.2207831384.

The spelling of 1317328521 in words is "one billion, three hundred seventeen million, three hundred twenty-eight thousand, five hundred twenty-one".