686508353 has 4 divisors (see below), whose sum is σ = 694222020. Its totient is φ = 678794688.

The previous prime is 686508349. The next prime is 686508359. The reversal of 686508353 is 353805686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 392317249 + 294191104 = 19807^2 + 17152^2 .

It is a cyclic number.

It is not a de Polignac number, because 686508353 - 2² = 686508349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686508359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856700 + ... + 3856877.

It is an arithmetic number, because the mean of its divisors is an integer number (173555505).

Almost surely, 2^686508353 is an apocalyptic number.

It is an amenable number.

686508353 is a deficient number, since it is larger than the sum of its proper divisors (7713667).

686508353 is an equidigital number, since it uses as much as digits as its factorization.

686508353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713666.

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 686508353 is about 26201.3044140936. The cubic root of 686508353 is about 882.1625330565.

The spelling of 686508353 in words is "six hundred eighty-six million, five hundred eight thousand, three hundred fifty-three".