681265943 has 2 divisors, whose sum is σ = 681265944. Its totient is φ = 681265942.

The previous prime is 681265933. The next prime is 681265993. The reversal of 681265943 is 349562186.

681265943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681265943 - 2⁸ = 681265687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681265894 and 681265903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681265913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340632971 + 340632972.

It is an arithmetic number, because the mean of its divisors is an integer number (340632972).

Almost surely, 2^681265943 is an apocalyptic number.

681265943 is a deficient number, since it is larger than the sum of its proper divisors (1).

681265943 is an equidigital number, since it uses as much as digits as its factorization.

681265943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 681265943 is about 26101.0716829788. The cubic root of 681265943 is about 879.9112957249.

The spelling of 681265943 in words is "six hundred eighty-one million, two hundred sixty-five thousand, nine hundred forty-three".