1317685509 has 24 divisors (see below), whose sum is σ = 2270843520. Its totient is φ = 752962392.

The previous prime is 1317685483. The next prime is 1317685529. The reversal of 1317685509 is 9055867131.

It is a happy number.

1317685509 is a `hidden beast` number, since 1 + 31 + 7 + 68 + 550 + 9 = 666.

It is not a de Polignac number, because 1317685509 - 2⁷ = 1317685381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317685529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 496669 + ... + 499314.

It is an arithmetic number, because the mean of its divisors is an integer number (94618480).

Almost surely, 2^1317685509 is an apocalyptic number.

It is an amenable number.

1317685509 is a deficient number, since it is larger than the sum of its proper divisors (953158011).

1317685509 is an equidigital number, since it uses as much as digits as its factorization.

1317685509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996006 (or 995993 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 1317685509 is about 36299.9381404432. The cubic root of 1317685509 is about 1096.3197972451.

The spelling of 1317685509 in words is "one billion, three hundred seventeen million, six hundred eighty-five thousand, five hundred nine".