688911611 has 2 divisors, whose sum is σ = 688911612. Its totient is φ = 688911610.

The previous prime is 688911599. The next prime is 688911647. The reversal of 688911611 is 116119886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688911611 - 2¹⁴ = 688895227 is a prime.

It is not a weakly prime, because it can be changed into another prime (688911911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344455805 + 344455806.

It is an arithmetic number, because the mean of its divisors is an integer number (344455806).

Almost surely, 2^688911611 is an apocalyptic number.

688911611 is a deficient number, since it is larger than the sum of its proper divisors (1).

688911611 is an equidigital number, since it uses as much as digits as its factorization.

688911611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 41.

The square root of 688911611 is about 26247.1257664530. The cubic root of 688911611 is about 883.1907288800.

The spelling of 688911611 in words is "six hundred eighty-eight million, nine hundred eleven thousand, six hundred eleven".