1317021313 has 4 divisors (see below), whose sum is σ = 1317519280. Its totient is φ = 1316523348.

The previous prime is 1317021301. The next prime is 1317021323. The reversal of 1317021313 is 3131207131.

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: 3131207131 = 13 ⋅240862087.

It is a cyclic number.

It is not a de Polignac number, because 1317021313 - 2¹⁷ = 1316890241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317021323) 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, 244995 + ... + 250312.

It is an arithmetic number, because the mean of its divisors is an integer number (329379820).

Almost surely, 2^1317021313 is an apocalyptic number.

It is an amenable number.

1317021313 is a deficient number, since it is larger than the sum of its proper divisors (497967).

1317021313 is an equidigital number, since it uses as much as digits as its factorization.

1317021313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497966.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 1317021313 is about 36290.7882664458. The cubic root of 1317021313 is about 1096.1355616792.

Adding to 1317021313 its reverse (3131207131), we get a palindrome (4448228444).

The spelling of 1317021313 in words is "one billion, three hundred seventeen million, twenty-one thousand, three hundred thirteen".