688340519 has 2 divisors, whose sum is σ = 688340520. Its totient is φ = 688340518.

The previous prime is 688340501. The next prime is 688340539. The reversal of 688340519 is 915043886.

688340519 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688340519 - 2²⁸ = 419905063 is a prime.

It is a super-3 number, since 3×688340519³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688340519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688340539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344170259 + 344170260.

It is an arithmetic number, because the mean of its divisors is an integer number (344170260).

Almost surely, 2^688340519 is an apocalyptic number.

688340519 is a deficient number, since it is larger than the sum of its proper divisors (1).

688340519 is an equidigital number, since it uses as much as digits as its factorization.

688340519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 688340519 is about 26236.2443768158. The cubic root of 688340519 is about 882.9466130941.

The spelling of 688340519 in words is "six hundred eighty-eight million, three hundred forty thousand, five hundred nineteen".