686312499 has 8 divisors (see below), whose sum is σ = 915229120. Its totient is φ = 457468776.

The previous prime is 686312477. The next prime is 686312507. The reversal of 686312499 is 994213686.

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

It is not a de Polignac number, because 686312499 - 2⁵ = 686312467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686312449) 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 7 ways as a sum of consecutive naturals, for example, 9984 + ... + 38370.

It is an arithmetic number, because the mean of its divisors is an integer number (114403640).

Almost surely, 2^686312499 is an apocalyptic number.

686312499 is a deficient number, since it is larger than the sum of its proper divisors (228916621).

686312499 is a wasteful number, since it uses less digits than its factorization.

686312499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36449.

The product of its digits is 559872, while the sum is 48.

The square root of 686312499 is about 26197.5666618104. The cubic root of 686312499 is about 882.0786343475.

The spelling of 686312499 in words is "six hundred eighty-six million, three hundred twelve thousand, four hundred ninety-nine".