687388811 has 2 divisors, whose sum is σ = 687388812. Its totient is φ = 687388810.

The previous prime is 687388789. The next prime is 687388813. The reversal of 687388811 is 118883786.

687388811 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-687388811 is a prime.

Together with 687388813, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687388811.

It is not a weakly prime, because it can be changed into another prime (687388813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343694405 + 343694406.

It is an arithmetic number, because the mean of its divisors is an integer number (343694406).

Almost surely, 2^687388811 is an apocalyptic number.

687388811 is a deficient number, since it is larger than the sum of its proper divisors (1).

687388811 is an equidigital number, since it uses as much as digits as its factorization.

687388811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 50.

The square root of 687388811 is about 26218.1008274818. The cubic root of 687388811 is about 882.5395011570.

The spelling of 687388811 in words is "six hundred eighty-seven million, three hundred eighty-eight thousand, eight hundred eleven".