686999429 has 2 divisors, whose sum is σ = 686999430. Its totient is φ = 686999428.

The previous prime is 686999419. The next prime is 686999447. The reversal of 686999429 is 924999686.

686999429 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., 686335204 + 664225 = 26198^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 686999429 - 2⁴ = 686999413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686999419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343499714 + 343499715.

It is an arithmetic number, because the mean of its divisors is an integer number (343499715).

Almost surely, 2^686999429 is an apocalyptic number.

It is an amenable number.

686999429 is a deficient number, since it is larger than the sum of its proper divisors (1).

686999429 is an equidigital number, since it uses as much as digits as its factorization.

686999429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15116544, while the sum is 62.

The square root of 686999429 is about 26210.6739516556. The cubic root of 686999429 is about 882.3728269747.

The spelling of 686999429 in words is "six hundred eighty-six million, nine hundred ninety-nine thousand, four hundred twenty-nine".