1688112709 has 2 divisors, whose sum is σ = 1688112710. Its totient is φ = 1688112708.

The previous prime is 1688112641. The next prime is 1688112739. The reversal of 1688112709 is 9072118861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1521780100 + 166332609 = 39010^2 + 12897^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688112709 - 2⁹ = 1688112197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688112739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844056354 + 844056355.

It is an arithmetic number, because the mean of its divisors is an integer number (844056355).

Almost surely, 2^1688112709 is an apocalyptic number.

It is an amenable number.

1688112709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688112709 is an equidigital number, since it uses as much as digits as its factorization.

1688112709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1688112709 is about 41086.6487925214. The cubic root of 1688112709 is about 1190.6948626384.

The spelling of 1688112709 in words is "one billion, six hundred eighty-eight million, one hundred twelve thousand, seven hundred nine".