1317355857 has 12 divisors (see below), whose sum is σ = 2014779780. Its totient is φ = 826576128.

The previous prime is 1317355847. The next prime is 1317355873. The reversal of 1317355857 is 7585537131.

1317355857 is a `hidden beast` number, since 1 + 31 + 7 + 35 + 585 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 943165521 + 374190336 = 30711^2 + 19344^2 .

It is not a de Polignac number, because 1317355857 - 2¹⁰ = 1317354833 is a prime.

It is a super-3 number, since 3×1317355857³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1317355847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4304932 + ... + 4305237.

It is an arithmetic number, because the mean of its divisors is an integer number (167898315).

Almost surely, 2^1317355857 is an apocalyptic number.

1317355857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1317355857 is a deficient number, since it is larger than the sum of its proper divisors (697423923).

1317355857 is a wasteful number, since it uses less digits than its factorization.

1317355857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610192 (or 8610189 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The square root of 1317355857 is about 36295.3971875223. The cubic root of 1317355857 is about 1096.2283656772.

The spelling of 1317355857 in words is "one billion, three hundred seventeen million, three hundred fifty-five thousand, eight hundred fifty-seven".