685536813 has 12 divisors (see below), whose sum is σ = 1066390780. Its totient is φ = 421868736.

The previous prime is 685536811. The next prime is 685536823. The reversal of 685536813 is 318635586.

It can be written as a sum of positive squares in 2 ways, for example, as 229159044 + 456377769 = 15138^2 + 21363^2 .

It is not a de Polignac number, because 685536813 - 2¹ = 685536811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685536811) 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, 2929528 + ... + 2929761.

Almost surely, 2^685536813 is an apocalyptic number.

It is an amenable number.

685536813 is a deficient number, since it is larger than the sum of its proper divisors (380853967).

685536813 is a wasteful number, since it uses less digits than its factorization.

685536813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5859308 (or 5859305 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 685536813 is about 26182.7579334187. The cubic root of 685536813 is about 881.7461939588.

The spelling of 685536813 in words is "six hundred eighty-five million, five hundred thirty-six thousand, eight hundred thirteen".