681082559 has 2 divisors, whose sum is σ = 681082560. Its totient is φ = 681082558.

The previous prime is 681082553. The next prime is 681082561. The reversal of 681082559 is 955280186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681082559 is a prime.

Together with 681082561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681082553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340541279 + 340541280.

It is an arithmetic number, because the mean of its divisors is an integer number (340541280).

Almost surely, 2^681082559 is an apocalyptic number.

681082559 is a deficient number, since it is larger than the sum of its proper divisors (1).

681082559 is an equidigital number, since it uses as much as digits as its factorization.

681082559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 681082559 is about 26097.5584873375. The cubic root of 681082559 is about 879.8323367733.

The spelling of 681082559 in words is "six hundred eighty-one million, eighty-two thousand, five hundred fifty-nine".