1317988816 has 10 divisors (see below), whose sum is σ = 2553603362. Its totient is φ = 658994400.

The previous prime is 1317988813. The next prime is 1317988817. The reversal of 1317988816 is 6188897131.

It can be written as a sum of positive squares in only one way, i.e., 1082673216 + 235315600 = 32904^2 + 15340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317988811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41187135 + ... + 41187166.

Almost surely, 2^1317988816 is an apocalyptic number.

1317988816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1317988816 is a deficient number, since it is larger than the sum of its proper divisors (1235614546).

1317988816 is an equidigital number, since it uses as much as digits as its factorization.

1317988816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82374309 (or 82374303 counting only the distinct ones).

The product of its digits is 580608, while the sum is 52.

The square root of 1317988816 is about 36304.1156895468. The cubic root of 1317988816 is about 1096.4039083516.

The spelling of 1317988816 in words is "one billion, three hundred seventeen million, nine hundred eighty-eight thousand, eight hundred sixteen".