1317247681 has 8 divisors (see below), whose sum is σ = 1361781344. Its totient is φ = 1273345920.

The previous prime is 1317247627. The next prime is 1317247721. The reversal of 1317247681 is 1867427131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1317247681 - 2¹⁷ = 1317116609 is a prime.

It is a super-2 number, since 2×1317247681² = 3470282906199755522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317247621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153735 + ... + 162076.

It is an arithmetic number, because the mean of its divisors is an integer number (170222668).

Almost surely, 2^1317247681 is an apocalyptic number.

It is an amenable number.

1317247681 is a deficient number, since it is larger than the sum of its proper divisors (44533663).

1317247681 is an equidigital number, since it uses as much as digits as its factorization.

1317247681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315951.

The product of its digits is 56448, while the sum is 40.

The square root of 1317247681 is about 36293.9069404218. The cubic root of 1317247681 is about 1096.1983588912.

The spelling of 1317247681 in words is "one billion, three hundred seventeen million, two hundred forty-seven thousand, six hundred eighty-one".