681605743 has 16 divisors (see below), whose sum is σ = 840623616. Its totient is φ = 538184160.

The previous prime is 681605741. The next prime is 681605779. The reversal of 681605743 is 347506186.

It is a happy number.

681605743 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 not a de Polignac number, because 681605743 - 2¹ = 681605741 is a prime.

It is a super-3 number, since 3×681605743³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681605696 and 681605705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681605741) 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, 38328 + ... + 53218.

It is an arithmetic number, because the mean of its divisors is an integer number (52538976).

Almost surely, 2^681605743 is an apocalyptic number.

681605743 is a deficient number, since it is larger than the sum of its proper divisors (159017873).

681605743 is a wasteful number, since it uses less digits than its factorization.

681605743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15414.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 681605743 is about 26107.5801827745. The cubic root of 681605743 is about 880.0575646744.

The spelling of 681605743 in words is "six hundred eighty-one million, six hundred five thousand, seven hundred forty-three".