687867244349 has 2 divisors, whose sum is σ = 687867244350. Its totient is φ = 687867244348.

The previous prime is 687867244331. The next prime is 687867244373. The reversal of 687867244349 is 943442768786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344195769124 + 343671475225 = 586682^2 + 586235^2 .

It is a cyclic number.

It is not a de Polignac number, because 687867244349 - 2²⁰ = 687866195773 is a prime.

It is a super-2 number, since 2×687867244349² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687867244319) 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, 343933622174 + 343933622175.

It is an arithmetic number, because the mean of its divisors is an integer number (343933622175).

Almost surely, 2^687867244349 is an apocalyptic number.

It is an amenable number.

687867244349 is a deficient number, since it is larger than the sum of its proper divisors (1).

687867244349 is an equidigital number, since it uses as much as digits as its factorization.

687867244349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 390168576, while the sum is 68.

The spelling of 687867244349 in words is "six hundred eighty-seven billion, eight hundred sixty-seven million, two hundred forty-four thousand, three hundred forty-nine".