687516469 has 2 divisors, whose sum is σ = 687516470. Its totient is φ = 687516468.

The previous prime is 687516443. The next prime is 687516497. The reversal of 687516469 is 964615786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464402500 + 223113969 = 21550^2 + 14937^2 .

It is a cyclic number.

It is not a de Polignac number, because 687516469 - 2⁷ = 687516341 is a prime.

It is a super-2 number, since 2×687516469² = 945357790292455922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687516169) 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, 343758234 + 343758235.

It is an arithmetic number, because the mean of its divisors is an integer number (343758235).

Almost surely, 2^687516469 is an apocalyptic number.

It is an amenable number.

687516469 is a deficient number, since it is larger than the sum of its proper divisors (1).

687516469 is an equidigital number, since it uses as much as digits as its factorization.

687516469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 687516469 is about 26220.5352538807. The cubic root of 687516469 is about 882.5941312064.

The spelling of 687516469 in words is "six hundred eighty-seven million, five hundred sixteen thousand, four hundred sixty-nine".