681487073 has 2 divisors, whose sum is σ = 681487074. Its totient is φ = 681487072.

The previous prime is 681487063. The next prime is 681487099. The reversal of 681487073 is 370784186.

681487073 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 can be written as a sum of positive squares in only one way, i.e., 649587169 + 31899904 = 25487^2 + 5648^2 .

It is a cyclic number.

It is not a de Polignac number, because 681487073 - 2¹⁴ = 681470689 is a prime.

It is a super-2 number, since 2×681487073² = 928849261332214658, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (681487013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340743536 + 340743537.

It is an arithmetic number, because the mean of its divisors is an integer number (340743537).

Almost surely, 2^681487073 is an apocalyptic number.

It is an amenable number.

681487073 is a deficient number, since it is larger than the sum of its proper divisors (1).

681487073 is an equidigital number, since it uses as much as digits as its factorization.

681487073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 681487073 is about 26105.3073722567. The cubic root of 681487073 is about 880.0064879859.

The spelling of 681487073 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, seventy-three".