687606811 has 2 divisors, whose sum is σ = 687606812. Its totient is φ = 687606810.

The previous prime is 687606809. The next prime is 687606847. The reversal of 687606811 is 118606786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687606811 - 2¹ = 687606809 is a prime.

It is a super-3 number, since 3×687606811³ (a number of 27 digits) contains 333 as substring.

Together with 687606809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (687606011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343803405 + 343803406.

It is an arithmetic number, because the mean of its divisors is an integer number (343803406).

Almost surely, 2^687606811 is an apocalyptic number.

687606811 is a deficient number, since it is larger than the sum of its proper divisors (1).

687606811 is an equidigital number, since it uses as much as digits as its factorization.

687606811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 687606811 is about 26222.2579310021. The cubic root of 687606811 is about 882.6327881357.

The spelling of 687606811 in words is "six hundred eighty-seven million, six hundred six thousand, eight hundred eleven".