1317321881 has 2 divisors, whose sum is σ = 1317321882. Its totient is φ = 1317321880.

The previous prime is 1317321871. The next prime is 1317321883. The reversal of 1317321881 is 1881237131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307184025 + 10137856 = 36155^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1317321881 - 2¹⁴ = 1317305497 is a prime.

It is a super-2 number, since 2×1317321881² = 3470673876322756322, which contains 22 as substring.

Together with 1317321883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1317321883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658660940 + 658660941.

It is an arithmetic number, because the mean of its divisors is an integer number (658660941).

Almost surely, 2^1317321881 is an apocalyptic number.

It is an amenable number.

1317321881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317321881 is an equidigital number, since it uses as much as digits as its factorization.

1317321881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 1317321881 is about 36294.9291361755. The cubic root of 1317321881 is about 1096.2189413001.

The spelling of 1317321881 in words is "one billion, three hundred seventeen million, three hundred twenty-one thousand, eight hundred eighty-one".