687516497 has 2 divisors, whose sum is σ = 687516498. Its totient is φ = 687516496.

The previous prime is 687516469. The next prime is 687516527. The reversal of 687516497 is 794615786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451095121 + 236421376 = 21239^2 + 15376^2 .

It is a cyclic number.

It is not a de Polignac number, because 687516497 - 2⁸ = 687516241 is a prime.

It is not a weakly prime, because it can be changed into another prime (687516097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343758248 + 343758249.

It is an arithmetic number, because the mean of its divisors is an integer number (343758249).

Almost surely, 2^687516497 is an apocalyptic number.

It is an amenable number.

687516497 is a deficient number, since it is larger than the sum of its proper divisors (1).

687516497 is an equidigital number, since it uses as much as digits as its factorization.

687516497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 687516497 is about 26220.5357878133. The cubic root of 687516497 is about 882.5941431880.

The spelling of 687516497 in words is "six hundred eighty-seven million, five hundred sixteen thousand, four hundred ninety-seven".