686413549 has 8 divisors (see below), whose sum is σ = 691321400. Its totient is φ = 681523200.

The previous prime is 686413523. The next prime is 686413591. The reversal of 686413549 is 945314686.

It can be written as a sum of positive squares in 4 ways, for example, as 206496900 + 479916649 = 14370^2 + 21907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686413549 - 2⁵ = 686413517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686413499 and 686413508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686413649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80029 + ... + 88189.

It is an arithmetic number, because the mean of its divisors is an integer number (86415175).

Almost surely, 2^686413549 is an apocalyptic number.

It is an amenable number.

686413549 is a deficient number, since it is larger than the sum of its proper divisors (4907851).

686413549 is a wasteful number, since it uses less digits than its factorization.

686413549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751.

The product of its digits is 622080, while the sum is 46.

The square root of 686413549 is about 26199.4952050607. The cubic root of 686413549 is about 882.1219235060.

The spelling of 686413549 in words is "six hundred eighty-six million, four hundred thirteen thousand, five hundred forty-nine".