686101 has 8 divisors (see below), whose sum is σ = 748440. Its totient is φ = 625152.

The previous prime is 686099. The next prime is 686117. The reversal of 686101 is 101686.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 680625 = 74^2 + 825^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 686101 - 2¹ = 686099 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 (686131) 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, 861 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (93555).

2⁶⁸⁶¹⁰¹ is an apocalyptic number.

It is an amenable number.

686101 is a deficient number, since it is larger than the sum of its proper divisors (62339).

686101 is a wasteful number, since it uses less digits than its factorization.

686101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 686101 is about 828.3121392325. The cubic root of 686101 is about 88.1988015804.

Adding to 686101 its reverse (101686), we get a palindrome (787787).

It can be divided in two parts, 686 and 101, that added together give a palindrome (787).

The spelling of 686101 in words is "six hundred eighty-six thousand, one hundred one".