681109939 has 2 divisors, whose sum is σ = 681109940. Its totient is φ = 681109938.

The previous prime is 681109909. The next prime is 681110033. The reversal of 681109939 is 939901186.

681109939 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 681109939 - 2⁹ = 681109427 is a prime.

It is not a weakly prime, because it can be changed into another prime (681109909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340554969 + 340554970.

It is an arithmetic number, because the mean of its divisors is an integer number (340554970).

Almost surely, 2^681109939 is an apocalyptic number.

681109939 is a deficient number, since it is larger than the sum of its proper divisors (1).

681109939 is an equidigital number, since it uses as much as digits as its factorization.

681109939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 681109939 is about 26098.0830522090. The cubic root of 681109939 is about 879.8441265758.

The spelling of 681109939 in words is "six hundred eighty-one million, one hundred nine thousand, nine hundred thirty-nine".