1318539685 has 8 divisors (see below), whose sum is σ = 1583000856. Its totient is φ = 1054329600.

The previous prime is 1318539619. The next prime is 1318539689. The reversal of 1318539685 is 5869358131.

1318539685 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 126495009 + 1192044676 = 11247^2 + 34526^2 .

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

It is not a de Polignac number, because 1318539685 - 2¹¹ = 1318537637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318539689) 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, 51016 + ... + 72385.

It is an arithmetic number, because the mean of its divisors is an integer number (197875107).

Almost surely, 2^1318539685 is an apocalyptic number.

It is an amenable number.

1318539685 is a deficient number, since it is larger than the sum of its proper divisors (264461171).

1318539685 is a wasteful number, since it uses less digits than its factorization.

1318539685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125543.

The product of its digits is 777600, while the sum is 49.

The square root of 1318539685 is about 36311.7017640319. The cubic root of 1318539685 is about 1096.5566387315.

The spelling of 1318539685 in words is "one billion, three hundred eighteen million, five hundred thirty-nine thousand, six hundred eighty-five".