681749459 has 2 divisors, whose sum is σ = 681749460. Its totient is φ = 681749458.

The previous prime is 681749449. The next prime is 681749473. The reversal of 681749459 is 954947186.

681749459 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 a de Polignac number, because none of the positive numbers 2^k-681749459 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 681749459.

It is not a weakly prime, because it can be changed into another prime (681749449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340874729 + 340874730.

It is an arithmetic number, because the mean of its divisors is an integer number (340874730).

Almost surely, 2^681749459 is an apocalyptic number.

681749459 is a deficient number, since it is larger than the sum of its proper divisors (1).

681749459 is an equidigital number, since it uses as much as digits as its factorization.

681749459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The square root of 681749459 is about 26110.3324184124. The cubic root of 681749459 is about 880.1194134612.

The spelling of 681749459 in words is "six hundred eighty-one million, seven hundred forty-nine thousand, four hundred fifty-nine".