681518711 has 2 divisors, whose sum is σ = 681518712. Its totient is φ = 681518710.

The previous prime is 681518639. The next prime is 681518741. The reversal of 681518711 is 117815186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681518711 - 2²⁶ = 614409847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681518741) 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, 340759355 + 340759356.

It is an arithmetic number, because the mean of its divisors is an integer number (340759356).

Almost surely, 2^681518711 is an apocalyptic number.

681518711 is a deficient number, since it is larger than the sum of its proper divisors (1).

681518711 is an equidigital number, since it uses as much as digits as its factorization.

681518711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 38.

The square root of 681518711 is about 26105.9133339556. The cubic root of 681518711 is about 880.0201058595.

The spelling of 681518711 in words is "six hundred eighty-one million, five hundred eighteen thousand, seven hundred eleven".