688454717 has 2 divisors, whose sum is σ = 688454718. Its totient is φ = 688454716.

The previous prime is 688454713. The next prime is 688454719. The reversal of 688454717 is 717454886.

It is a happy number.

688454717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437897476 + 250557241 = 20926^2 + 15829^2 .

It is a cyclic number.

It is not a de Polignac number, because 688454717 - 2² = 688454713 is a prime.

Together with 688454719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688454713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344227358 + 344227359.

It is an arithmetic number, because the mean of its divisors is an integer number (344227359).

Almost surely, 2^688454717 is an apocalyptic number.

It is an amenable number.

688454717 is a deficient number, since it is larger than the sum of its proper divisors (1).

688454717 is an equidigital number, since it uses as much as digits as its factorization.

688454717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 50.

The square root of 688454717 is about 26238.4206270118. The cubic root of 688454717 is about 882.9954383286.

The spelling of 688454717 in words is "six hundred eighty-eight million, four hundred fifty-four thousand, seven hundred seventeen".