687314083217 has 2 divisors, whose sum is σ = 687314083218. Its totient is φ = 687314083216.

The previous prime is 687314083201. The next prime is 687314083223. The reversal of 687314083217 is 712380413786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519046761601 + 168267321616 = 720449^2 + 410204^2 .

It is a cyclic number.

It is not a de Polignac number, because 687314083217 - 2⁴ = 687314083201 is a prime.

It is not a weakly prime, because it can be changed into another prime (687314083297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343657041608 + 343657041609.

It is an arithmetic number, because the mean of its divisors is an integer number (343657041609).

Almost surely, 2^687314083217 is an apocalyptic number.

It is an amenable number.

687314083217 is a deficient number, since it is larger than the sum of its proper divisors (1).

687314083217 is an equidigital number, since it uses as much as digits as its factorization.

687314083217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 687314083217 in words is "six hundred eighty-seven billion, three hundred fourteen million, eighty-three thousand, two hundred seventeen".