681073139 has 2 divisors, whose sum is σ = 681073140. Its totient is φ = 681073138.

The previous prime is 681073121. The next prime is 681073153. The reversal of 681073139 is 931370186.

681073139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681073139 - 2¹² = 681069043 is a prime.

It is not a weakly prime, because it can be changed into another prime (681073039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340536569 + 340536570.

It is an arithmetic number, because the mean of its divisors is an integer number (340536570).

Almost surely, 2^681073139 is an apocalyptic number.

681073139 is a deficient number, since it is larger than the sum of its proper divisors (1).

681073139 is an equidigital number, since it uses as much as digits as its factorization.

681073139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 681073139 is about 26097.3780100607. The cubic root of 681073139 is about 879.8282804570.

The spelling of 681073139 in words is "six hundred eighty-one million, seventy-three thousand, one hundred thirty-nine".