1317887681 has 8 divisors (see below), whose sum is σ = 1446306624. Its totient is φ = 1190903920.

The previous prime is 1317887677. The next prime is 1317887713. The reversal of 1317887681 is 1867887131.

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 1317887681 - 2² = 1317887677 is a prime.

It is a super-2 number, since 2×1317887681² = 3473655879463115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1317887611) 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, 356870 + ... + 360543.

It is an arithmetic number, because the mean of its divisors is an integer number (180788328).

Almost surely, 2^1317887681 is an apocalyptic number.

1317887681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1317887681 is a deficient number, since it is larger than the sum of its proper divisors (128418943).

1317887681 is a wasteful number, since it uses less digits than its factorization.

1317887681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717591.

The product of its digits is 451584, while the sum is 50.

The square root of 1317887681 is about 36302.7227766734. The cubic root of 1317887681 is about 1096.3758636913.

The spelling of 1317887681 in words is "one billion, three hundred seventeen million, eight hundred eighty-seven thousand, six hundred eighty-one".