1317021668 has 6 divisors (see below), whose sum is σ = 2304787926. Its totient is φ = 658510832.

The previous prime is 1317021647. The next prime is 1317021683. The reversal of 1317021668 is 8661207131.

It can be written as a sum of positive squares in only one way, i.e., 936849664 + 380172004 = 30608^2 + 19498^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164627705 + ... + 164627712.

It is an arithmetic number, because the mean of its divisors is an integer number (384131321).

Almost surely, 2^1317021668 is an apocalyptic number.

It is an amenable number.

1317021668 is a deficient number, since it is larger than the sum of its proper divisors (987766258).

1317021668 is a wasteful number, since it uses less digits than its factorization.

1317021668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329255421 (or 329255419 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1317021668 is about 36290.7931574938. The cubic root of 1317021668 is about 1096.1356601661.

Adding to 1317021668 its reverse (8661207131), we get a palindrome (9978228799).

The spelling of 1317021668 in words is "one billion, three hundred seventeen million, twenty-one thousand, six hundred sixty-eight".