688698071 has 2 divisors, whose sum is σ = 688698072. Its totient is φ = 688698070.

The previous prime is 688698011. The next prime is 688698089. The reversal of 688698071 is 170896886.

688698071 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 is a cyclic number.

It is not a de Polignac number, because 688698071 - 2⁶ = 688698007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688698011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344349035 + 344349036.

It is an arithmetic number, because the mean of its divisors is an integer number (344349036).

Almost surely, 2^688698071 is an apocalyptic number.

688698071 is a deficient number, since it is larger than the sum of its proper divisors (1).

688698071 is an equidigital number, since it uses as much as digits as its factorization.

688698071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 688698071 is about 26243.0575771955. The cubic root of 688698071 is about 883.0994660654.

The spelling of 688698071 in words is "six hundred eighty-eight million, six hundred ninety-eight thousand, seventy-one".