681733939 has 2 divisors, whose sum is σ = 681733940. Its totient is φ = 681733938.

The previous prime is 681733931. The next prime is 681733973. The reversal of 681733939 is 939337186.

681733939 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 681733939 - 2³ = 681733931 is a prime.

It is a super-2 number, since 2×681733939² = 929522327168911442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681733892 and 681733901.

It is not a weakly prime, because it can be changed into another prime (681733931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340866969 + 340866970.

It is an arithmetic number, because the mean of its divisors is an integer number (340866970).

Almost surely, 2^681733939 is an apocalyptic number.

681733939 is a deficient number, since it is larger than the sum of its proper divisors (1).

681733939 is an equidigital number, since it uses as much as digits as its factorization.

681733939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 49.

The square root of 681733939 is about 26110.0352163684. The cubic root of 681733939 is about 880.1127347824.

The spelling of 681733939 in words is "six hundred eighty-one million, seven hundred thirty-three thousand, nine hundred thirty-nine".