686525117 has 4 divisors (see below), whose sum is σ = 686607900. Its totient is φ = 686442336.

The previous prime is 686525111. The next prime is 686525129. The reversal of 686525117 is 711525686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 711525686 = 2 ⋅355762843.

It can be written as a sum of positive squares in 2 ways, for example, as 357247801 + 329277316 = 18901^2 + 18146^2 .

It is a cyclic number.

It is not a de Polignac number, because 686525117 - 2²⁶ = 619416253 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 (686525111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27368 + ... + 46065.

It is an arithmetic number, because the mean of its divisors is an integer number (171651975).

Almost surely, 2^686525117 is an apocalyptic number.

It is an amenable number.

686525117 is a deficient number, since it is larger than the sum of its proper divisors (82783).

686525117 is an equidigital number, since it uses as much as digits as its factorization.

686525117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82782.

The product of its digits is 100800, while the sum is 41.

The square root of 686525117 is about 26201.6243198776. The cubic root of 686525117 is about 882.1697135724.

The spelling of 686525117 in words is "six hundred eighty-six million, five hundred twenty-five thousand, one hundred seventeen".