1688723369 has 2 divisors, whose sum is σ = 1688723370. Its totient is φ = 1688723368.

The previous prime is 1688723359. The next prime is 1688723431. The reversal of 1688723369 is 9633278861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1282499344 + 406224025 = 35812^2 + 20155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688723369 - 2¹⁶ = 1688657833 is a prime.

It is a super-2 number, since 2×1688723369² = 5703573234013420322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1688723369.

It is not a weakly prime, because it can be changed into another prime (1688723359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844361684 + 844361685.

It is an arithmetic number, because the mean of its divisors is an integer number (844361685).

Almost surely, 2^1688723369 is an apocalyptic number.

It is an amenable number.

1688723369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688723369 is an equidigital number, since it uses as much as digits as its factorization.

1688723369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The square root of 1688723369 is about 41094.0794884129. The cubic root of 1688723369 is about 1190.8384198119.

The spelling of 1688723369 in words is "one billion, six hundred eighty-eight million, seven hundred twenty-three thousand, three hundred sixty-nine".