685709481 has 4 divisors (see below), whose sum is σ = 914279312. Its totient is φ = 457139652.

The previous prime is 685709471. The next prime is 685709483. The reversal of 685709481 is 184907586.

685709481 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685709481 - 2⁶ = 685709417 is a prime.

It is a super-2 number, since 2×685709481² = 940394984666578722, 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 685709481.

It is not an unprimeable number, because it can be changed into a prime (685709483) 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, 114284911 + ... + 114284916.

It is an arithmetic number, because the mean of its divisors is an integer number (228569828).

Almost surely, 2^685709481 is an apocalyptic number.

It is an amenable number.

685709481 is a deficient number, since it is larger than the sum of its proper divisors (228569831).

685709481 is a wasteful number, since it uses less digits than its factorization.

685709481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228569830.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 685709481 is about 26186.0550866296. The cubic root of 685709481 is about 881.8202170058.

The spelling of 685709481 in words is "six hundred eighty-five million, seven hundred nine thousand, four hundred eighty-one".