688912193 has 2 divisors, whose sum is σ = 688912194. Its totient is φ = 688912192.

The previous prime is 688912187. The next prime is 688912253. The reversal of 688912193 is 391219886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345662464 + 343249729 = 18592^2 + 18527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688912193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688912183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344456096 + 344456097.

It is an arithmetic number, because the mean of its divisors is an integer number (344456097).

Almost surely, 2^688912193 is an apocalyptic number.

It is an amenable number.

688912193 is a deficient number, since it is larger than the sum of its proper divisors (1).

688912193 is an equidigital number, since it uses as much as digits as its factorization.

688912193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 688912193 is about 26247.1368533789. The cubic root of 688912193 is about 883.1909775896.

The spelling of 688912193 in words is "six hundred eighty-eight million, nine hundred twelve thousand, one hundred ninety-three".