681980911 has 2 divisors, whose sum is σ = 681980912. Its totient is φ = 681980910.

The previous prime is 681980909. The next prime is 681980917. The reversal of 681980911 is 119089186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681980911 - 2¹ = 681980909 is a prime.

Together with 681980909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681980917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340990455 + 340990456.

It is an arithmetic number, because the mean of its divisors is an integer number (340990456).

Almost surely, 2^681980911 is an apocalyptic number.

681980911 is a deficient number, since it is larger than the sum of its proper divisors (1).

681980911 is an equidigital number, since it uses as much as digits as its factorization.

681980911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 681980911 is about 26114.7642340497. The cubic root of 681980911 is about 880.2190015370.

The spelling of 681980911 in words is "six hundred eighty-one million, nine hundred eighty thousand, nine hundred eleven".