686329549 has 2 divisors, whose sum is σ = 686329550. Its totient is φ = 686329548.

The previous prime is 686329547. The next prime is 686329577. The reversal of 686329549 is 945923686.

686329549 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., 685916100 + 413449 = 26190^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 686329549 - 2¹ = 686329547 is a prime.

Together with 686329547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 686329496 and 686329505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686329541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343164774 + 343164775.

It is an arithmetic number, because the mean of its divisors is an integer number (343164775).

Almost surely, 2^686329549 is an apocalyptic number.

It is an amenable number.

686329549 is a deficient number, since it is larger than the sum of its proper divisors (1).

686329549 is an equidigital number, since it uses as much as digits as its factorization.

686329549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 52.

The square root of 686329549 is about 26197.8920716916. The cubic root of 686329549 is about 882.0859387538.

The spelling of 686329549 in words is "six hundred eighty-six million, three hundred twenty-nine thousand, five hundred forty-nine".