685340041 has 9 divisors (see below), whose sum is σ = 701491399. Its totient is φ = 669554104.

The previous prime is 685340009. The next prime is 685340053. The reversal of 685340041 is 140043586.

It is a happy number.

The square root of 685340041 is 26179.

It is a perfect power (a square), and thus also a powerful number.

685340041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 625200016 = 7755^2 + 25004^2 .

It is not a de Polignac number, because 685340041 - 2⁵ = 685340009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685339985 and 685340012.

It is not an unprimeable number, because it can be changed into a prime (685340081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1230135 + ... + 1230691.

Almost surely, 2^685340041 is an apocalyptic number.

685340041 is the 26179-th square number.

685340041 is the 13090-th centered octagonal number.

It is an amenable number.

685340041 is a deficient number, since it is larger than the sum of its proper divisors (16151358).

685340041 is an frugal number, since it uses more digits than its factorization.

685340041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The cubic root of 685340041 is about 881.6618223336.

The spelling of 685340041 in words is "six hundred eighty-five million, three hundred forty thousand, forty-one".