688704241 has 2 divisors, whose sum is σ = 688704242. Its totient is φ = 688704240.

The previous prime is 688704197. The next prime is 688704259. The reversal of 688704241 is 142407886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676208016 + 12496225 = 26004^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 688704241 - 2¹³ = 688696049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688704194 and 688704203.

It is not a weakly prime, because it can be changed into another prime (688704281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344352120 + 344352121.

It is an arithmetic number, because the mean of its divisors is an integer number (344352121).

Almost surely, 2^688704241 is an apocalyptic number.

It is an amenable number.

688704241 is a deficient number, since it is larger than the sum of its proper divisors (1).

688704241 is an equidigital number, since it uses as much as digits as its factorization.

688704241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 688704241 is about 26243.1751318319. The cubic root of 688704241 is about 883.1021032672.

The spelling of 688704241 in words is "six hundred eighty-eight million, seven hundred four thousand, two hundred forty-one".