687311 has 2 divisors, whose sum is σ = 687312. Its totient is φ = 687310.

The previous prime is 687307. The next prime is 687317. The reversal of 687311 is 113786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687311 - 2² = 687307 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 (687317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343655 + 343656.

It is an arithmetic number, because the mean of its divisors is an integer number (343656).

2⁶⁸⁷³¹¹ is an apocalyptic number.

687311 is a deficient number, since it is larger than the sum of its proper divisors (1).

687311 is an equidigital number, since it uses as much as digits as its factorization.

687311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 687311 is about 829.0422184666. The cubic root of 687311 is about 88.2506199348.

The spelling of 687311 in words is "six hundred eighty-seven thousand, three hundred eleven".