688485137 has 2 divisors, whose sum is σ = 688485138. Its totient is φ = 688485136.

The previous prime is 688485113. The next prime is 688485163. The reversal of 688485137 is 731584886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688485121 + 16 = 26239^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 688485137 - 2¹⁰ = 688484113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688485437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344242568 + 344242569.

It is an arithmetic number, because the mean of its divisors is an integer number (344242569).

Almost surely, 2^688485137 is an apocalyptic number.

It is an amenable number.

688485137 is a deficient number, since it is larger than the sum of its proper divisors (1).

688485137 is an equidigital number, since it uses as much as digits as its factorization.

688485137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 688485137 is about 26239.0003048897. Note that the first 3 decimals coincide. The cubic root of 688485137 is about 883.0084434568.

The spelling of 688485137 in words is "six hundred eighty-eight million, four hundred eighty-five thousand, one hundred thirty-seven".