1317890685 has 32 divisors (see below), whose sum is σ = 2203361280. Its totient is φ = 671381568.

The previous prime is 1317890671. The next prime is 1317890689. The reversal of 1317890685 is 5860987131.

It is not a de Polignac number, because 1317890685 - 2⁵ = 1317890653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317890689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294132 + ... + 298578.

It is an arithmetic number, because the mean of its divisors is an integer number (68855040).

Almost surely, 2^1317890685 is an apocalyptic number.

1317890685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1317890685 is a deficient number, since it is larger than the sum of its proper divisors (885470595).

1317890685 is a wasteful number, since it uses less digits than its factorization.

1317890685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1317890685 is about 36302.7641509569. The cubic root of 1317890685 is about 1096.3766967190.

The spelling of 1317890685 in words is "one billion, three hundred seventeen million, eight hundred ninety thousand, six hundred eighty-five".