688361447 has 2 divisors, whose sum is σ = 688361448. Its totient is φ = 688361446.

The previous prime is 688361441. The next prime is 688361473. The reversal of 688361447 is 744163886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688361447 - 2²⁴ = 671584231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688361441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344180723 + 344180724.

It is an arithmetic number, because the mean of its divisors is an integer number (344180724).

Almost surely, 2^688361447 is an apocalyptic number.

688361447 is a deficient number, since it is larger than the sum of its proper divisors (1).

688361447 is an equidigital number, since it uses as much as digits as its factorization.

688361447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 47.

The square root of 688361447 is about 26236.6432113561. The cubic root of 688361447 is about 882.9555612425.

The spelling of 688361447 in words is "six hundred eighty-eight million, three hundred sixty-one thousand, four hundred forty-seven".