681600859 has 2 divisors, whose sum is σ = 681600860. Its totient is φ = 681600858.

The previous prime is 681600811. The next prime is 681600911. The reversal of 681600859 is 958006186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681600859 - 2¹⁷ = 681469787 is a prime.

It is not a weakly prime, because it can be changed into another prime (681600559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340800429 + 340800430.

It is an arithmetic number, because the mean of its divisors is an integer number (340800430).

Almost surely, 2^681600859 is an apocalyptic number.

681600859 is a deficient number, since it is larger than the sum of its proper divisors (1).

681600859 is an equidigital number, since it uses as much as digits as its factorization.

681600859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 681600859 is about 26107.4866465541. The cubic root of 681600859 is about 880.0554626717.

The spelling of 681600859 in words is "six hundred eighty-one million, six hundred thousand, eight hundred fifty-nine".