685256831 has 16 divisors (see below), whose sum is σ = 825096960. Its totient is φ = 555958080.

The previous prime is 685256807. The next prime is 685256843. The reversal of 685256831 is 138652586.

685256831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685256831 is a prime.

It is a super-2 number, since 2×685256831² = 939153848864325122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685256531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283016 + ... + 285426.

It is an arithmetic number, because the mean of its divisors is an integer number (51568560).

Almost surely, 2^685256831 is an apocalyptic number.

685256831 is a deficient number, since it is larger than the sum of its proper divisors (139840129).

685256831 is a wasteful number, since it uses less digits than its factorization.

685256831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574.

The product of its digits is 345600, while the sum is 44.

The square root of 685256831 is about 26177.4107008314. The cubic root of 685256831 is about 881.6261388066.

The spelling of 685256831 in words is "six hundred eighty-five million, two hundred fifty-six thousand, eight hundred thirty-one".