688229369 has 2 divisors, whose sum is σ = 688229370. Its totient is φ = 688229368.

The previous prime is 688229359. The next prime is 688229401. The reversal of 688229369 is 963922886.

It is a happy number.

688229369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685811344 + 2418025 = 26188^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688229369 is a prime.

It is a super-2 number, since 2×688229369² = 947319328708276322, 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 688229369.

It is not a weakly prime, because it can be changed into another prime (688229359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344114684 + 344114685.

It is an arithmetic number, because the mean of its divisors is an integer number (344114685).

Almost surely, 2^688229369 is an apocalyptic number.

It is an amenable number.

688229369 is a deficient number, since it is larger than the sum of its proper divisors (1).

688229369 is an equidigital number, since it uses as much as digits as its factorization.

688229369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 53.

The square root of 688229369 is about 26234.1260384256. The cubic root of 688229369 is about 882.8990858426.

The spelling of 688229369 in words is "six hundred eighty-eight million, two hundred twenty-nine thousand, three hundred sixty-nine".