686861211 has 8 divisors (see below), whose sum is σ = 924217360. Its totient is φ = 453706272.

The previous prime is 686861173. The next prime is 686861221. The reversal of 686861211 is 112168686.

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

It is not a de Polignac number, because 686861211 - 2²⁹ = 149990299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686861211.

It is not an unprimeable number, because it can be changed into a prime (686861221) 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, 1049920 + ... + 1050573.

It is an arithmetic number, because the mean of its divisors is an integer number (115527170).

Almost surely, 2^686861211 is an apocalyptic number.

686861211 is a deficient number, since it is larger than the sum of its proper divisors (237356149).

686861211 is a wasteful number, since it uses less digits than its factorization.

686861211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100605.

The product of its digits is 27648, while the sum is 39.

The square root of 686861211 is about 26208.0371451202. The cubic root of 686861211 is about 882.3136478923.

The spelling of 686861211 in words is "six hundred eighty-six million, eight hundred sixty-one thousand, two hundred eleven".