687311587 has 2 divisors, whose sum is σ = 687311588. Its totient is φ = 687311586.

The previous prime is 687311561. The next prime is 687311621. The reversal of 687311587 is 785113786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687311587 - 2¹⁵ = 687278819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687318587) 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, 343655793 + 343655794.

It is an arithmetic number, because the mean of its divisors is an integer number (343655794).

Almost surely, 2^687311587 is an apocalyptic number.

687311587 is a deficient number, since it is larger than the sum of its proper divisors (1).

687311587 is an equidigital number, since it uses as much as digits as its factorization.

687311587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 687311587 is about 26216.6280631206. The cubic root of 687311587 is about 882.5064505838.

The spelling of 687311587 in words is "six hundred eighty-seven million, three hundred eleven thousand, five hundred eighty-seven".