685853531 has 6 divisors (see below), whose sum is σ = 753872196. Its totient is φ = 623503100.

The previous prime is 685853527. The next prime is 685853543. The reversal of 685853531 is 135358586.

685853531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685853531 - 2² = 685853527 is a prime.

It is a super-2 number, since 2×685853531² = 940790131970335922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (685853551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2833985 + ... + 2834226.

It is an arithmetic number, because the mean of its divisors is an integer number (125645366).

Almost surely, 2^685853531 is an apocalyptic number.

685853531 is a deficient number, since it is larger than the sum of its proper divisors (68018665).

685853531 is a wasteful number, since it uses less digits than its factorization.

685853531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668233 (or 5668222 counting only the distinct ones).

The product of its digits is 432000, while the sum is 44.

The square root of 685853531 is about 26188.8054519484. The cubic root of 685853531 is about 881.8819619633.

The spelling of 685853531 in words is "six hundred eighty-five million, eight hundred fifty-three thousand, five hundred thirty-one".