681359943 has 16 divisors (see below), whose sum is σ = 1023040512. Its totient is φ = 399624000.

The previous prime is 681359933. The next prime is 681360013. The reversal of 681359943 is 349953186.

681359943 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 681359943 - 2⁴ = 681359927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681359892 and 681359901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681359923) 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, 331998 + ... + 334043.

It is an arithmetic number, because the mean of its divisors is an integer number (63940032).

Almost surely, 2^681359943 is an apocalyptic number.

681359943 is a deficient number, since it is larger than the sum of its proper divisors (341680569).

681359943 is a wasteful number, since it uses less digits than its factorization.

681359943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666086.

The product of its digits is 699840, while the sum is 48.

The square root of 681359943 is about 26102.8723132149. The cubic root of 681359943 is about 879.9517634545.

The spelling of 681359943 in words is "six hundred eighty-one million, three hundred fifty-nine thousand, nine hundred forty-three".