681285911 has 2 divisors, whose sum is σ = 681285912. Its totient is φ = 681285910.

The previous prime is 681285887. The next prime is 681285919. The reversal of 681285911 is 119582186.

681285911 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 a de Polignac number, because none of the positive numbers 2^k-681285911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681285919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340642955 + 340642956.

It is an arithmetic number, because the mean of its divisors is an integer number (340642956).

Almost surely, 2^681285911 is an apocalyptic number.

681285911 is a deficient number, since it is larger than the sum of its proper divisors (1).

681285911 is an equidigital number, since it uses as much as digits as its factorization.

681285911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 41.

The square root of 681285911 is about 26101.4541932054. The cubic root of 681285911 is about 879.9198924152.

The spelling of 681285911 in words is "six hundred eighty-one million, two hundred eighty-five thousand, nine hundred eleven".