688436041 has 2 divisors, whose sum is σ = 688436042. Its totient is φ = 688436040.

The previous prime is 688436039. The next prime is 688436053. The reversal of 688436041 is 140634886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 581002816 + 107433225 = 24104^2 + 10365^2 .

It is a cyclic number.

It is not a de Polignac number, because 688436041 - 2¹ = 688436039 is a prime.

Together with 688436039, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 688435985 and 688436003.

It is not a weakly prime, because it can be changed into another prime (688436071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344218020 + 344218021.

It is an arithmetic number, because the mean of its divisors is an integer number (344218021).

Almost surely, 2^688436041 is an apocalyptic number.

It is an amenable number.

688436041 is a deficient number, since it is larger than the sum of its proper divisors (1).

688436041 is an equidigital number, since it uses as much as digits as its factorization.

688436041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 688436041 is about 26238.0647342749. The cubic root of 688436041 is about 882.9874537938.

The spelling of 688436041 in words is "six hundred eighty-eight million, four hundred thirty-six thousand, forty-one".