686185213 has 16 divisors (see below), whose sum is σ = 794542464. Its totient is φ = 580449600.

The previous prime is 686185207. The next prime is 686185219. The reversal of 686185213 is 312581686.

It is an interprime number because it is at equal distance from previous prime (686185207) and next prime (686185219).

It is a cyclic number.

It is not a de Polignac number, because 686185213 - 2⁹ = 686184701 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 (686185219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243931 + ... + 246727.

It is an arithmetic number, because the mean of its divisors is an integer number (49658904).

Almost surely, 2^686185213 is an apocalyptic number.

It is an amenable number.

686185213 is a deficient number, since it is larger than the sum of its proper divisors (108357251).

686185213 is a wasteful number, since it uses less digits than its factorization.

686185213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252.

The product of its digits is 69120, while the sum is 40.

The square root of 686185213 is about 26195.1372013968. The cubic root of 686185213 is about 882.0240998106.

The spelling of 686185213 in words is "six hundred eighty-six million, one hundred eighty-five thousand, two hundred thirteen".