688246417 has 2 divisors, whose sum is σ = 688246418. Its totient is φ = 688246416.

The previous prime is 688246399. The next prime is 688246451. The reversal of 688246417 is 714642886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679957776 + 8288641 = 26076^2 + 2879^2 .

It is a cyclic number.

It is not a de Polignac number, because 688246417 - 2¹⁹ = 687722129 is a prime.

It is not a weakly prime, because it can be changed into another prime (688246217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344123208 + 344123209.

It is an arithmetic number, because the mean of its divisors is an integer number (344123209).

Almost surely, 2^688246417 is an apocalyptic number.

It is an amenable number.

688246417 is a deficient number, since it is larger than the sum of its proper divisors (1).

688246417 is an equidigital number, since it uses as much as digits as its factorization.

688246417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 688246417 is about 26234.4509567096. The cubic root of 688246417 is about 882.9063758247.

The spelling of 688246417 in words is "six hundred eighty-eight million, two hundred forty-six thousand, four hundred seventeen".