686521269 has 12 divisors (see below), whose sum is σ = 1133305056. Its totient is φ = 392297832.

The previous prime is 686521247. The next prime is 686521271. The reversal of 686521269 is 962125686.

686521269 is a `hidden beast` number, since 68 + 6 + 521 + 2 + 69 = 666.

It is not a de Polignac number, because 686521269 - 2⁵ = 686521237 is a prime.

It is a super-2 number, since 2×686521269² = 942622905578740722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686521229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5448519 + ... + 5448644.

It is an arithmetic number, because the mean of its divisors is an integer number (94442088).

Almost surely, 2^686521269 is an apocalyptic number.

It is an amenable number.

686521269 is a deficient number, since it is larger than the sum of its proper divisors (446783787).

686521269 is a wasteful number, since it uses less digits than its factorization.

686521269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897176 (or 10897173 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 686521269 is about 26201.5508892126. The cubic root of 686521269 is about 882.1680653707.

The spelling of 686521269 in words is "six hundred eighty-six million, five hundred twenty-one thousand, two hundred sixty-nine".