1317664549 has 4 divisors (see below), whose sum is σ = 1374954336. Its totient is φ = 1260374764.

The previous prime is 1317664541. The next prime is 1317664559. The reversal of 1317664549 is 9454667131.

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.

It is a cyclic number.

It is not a de Polignac number, because 1317664549 - 2³ = 1317664541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317664499 and 1317664508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317664541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28644859 + ... + 28644904.

It is an arithmetic number, because the mean of its divisors is an integer number (343738584).

Almost surely, 2^1317664549 is an apocalyptic number.

It is an amenable number.

1317664549 is a deficient number, since it is larger than the sum of its proper divisors (57289787).

1317664549 is an equidigital number, since it uses as much as digits as its factorization.

1317664549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57289786.

The product of its digits is 544320, while the sum is 46.

The square root of 1317664549 is about 36299.6494335689. The cubic root of 1317664549 is about 1096.3139842787.

The spelling of 1317664549 in words is "one billion, three hundred seventeen million, six hundred sixty-four thousand, five hundred forty-nine".