688533617 has 2 divisors, whose sum is σ = 688533618. Its totient is φ = 688533616.

The previous prime is 688533611. The next prime is 688533649. The reversal of 688533617 is 716335886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588353536 + 100180081 = 24256^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 688533617 - 2⁸ = 688533361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688533611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344266808 + 344266809.

It is an arithmetic number, because the mean of its divisors is an integer number (344266809).

Almost surely, 2^688533617 is an apocalyptic number.

It is an amenable number.

688533617 is a deficient number, since it is larger than the sum of its proper divisors (1).

688533617 is an equidigital number, since it uses as much as digits as its factorization.

688533617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 688533617 is about 26239.9241043110. The cubic root of 688533617 is about 883.0291687866.

The spelling of 688533617 in words is "six hundred eighty-eight million, five hundred thirty-three thousand, six hundred seventeen".