688716269 has 2 divisors, whose sum is σ = 688716270. Its totient is φ = 688716268.

The previous prime is 688716247. The next prime is 688716277. The reversal of 688716269 is 962617886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667602244 + 21114025 = 25838^2 + 4595^2 .

It is a cyclic number.

It is not a de Polignac number, because 688716269 - 2²⁸ = 420280813 is a prime.

It is a super-2 number, since 2×688716269² = 948660198370560722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688716269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688716229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344358134 + 344358135.

It is an arithmetic number, because the mean of its divisors is an integer number (344358135).

Almost surely, 2^688716269 is an apocalyptic number.

It is an amenable number.

688716269 is a deficient number, since it is larger than the sum of its proper divisors (1).

688716269 is an equidigital number, since it uses as much as digits as its factorization.

688716269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 688716269 is about 26243.4042951748. The cubic root of 688716269 is about 883.1072442695.

The spelling of 688716269 in words is "six hundred eighty-eight million, seven hundred sixteen thousand, two hundred sixty-nine".