686114891 has 12 divisors (see below), whose sum is σ = 861897456. Its totient is φ = 534634320.

The previous prime is 686114879. The next prime is 686114893. The reversal of 686114891 is 198411686.

It is not a de Polignac number, because 686114891 - 2¹⁰ = 686113867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686114893) 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 11 ways as a sum of consecutive naturals, for example, 404180 + ... + 405873.

It is an arithmetic number, because the mean of its divisors is an integer number (71824788).

Almost surely, 2^686114891 is an apocalyptic number.

686114891 is a deficient number, since it is larger than the sum of its proper divisors (175782565).

686114891 is a wasteful number, since it uses less digits than its factorization.

686114891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810082 (or 810071 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 686114891 is about 26193.7948949746. The cubic root of 686114891 is about 881.9939680927.

The spelling of 686114891 in words is "six hundred eighty-six million, one hundred fourteen thousand, eight hundred ninety-one".