686954831 has 4 divisors (see below), whose sum is σ = 687061872. Its totient is φ = 686847792.

The previous prime is 686954809. The next prime is 686954857. The reversal of 686954831 is 138459686.

686954831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686954831 is a prime.

It is a super-2 number, since 2×686954831² = 943813879668477122, which contains 22 as substring.

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 686954831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686954131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43235 + ... + 56948.

It is an arithmetic number, because the mean of its divisors is an integer number (171765468).

Almost surely, 2^686954831 is an apocalyptic number.

686954831 is a deficient number, since it is larger than the sum of its proper divisors (107041).

686954831 is a wasteful number, since it uses less digits than its factorization.

686954831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107040.

The product of its digits is 1244160, while the sum is 50.

The square root of 686954831 is about 26209.8231775798. The cubic root of 686954831 is about 882.3537328710.

The spelling of 686954831 in words is "six hundred eighty-six million, nine hundred fifty-four thousand, eight hundred thirty-one".