686825121 has 8 divisors (see below), whose sum is σ = 916362720. Its totient is φ = 457585472.

The previous prime is 686825093. The next prime is 686825137. The reversal of 686825121 is 121528686.

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 686825121 - 2¹⁰ = 686824097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686825121.

It is not an unprimeable number, because it can be changed into a prime (686825141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69051 + ... + 78368.

It is an arithmetic number, because the mean of its divisors is an integer number (114545340).

Almost surely, 2^686825121 is an apocalyptic number.

It is an amenable number.

686825121 is a deficient number, since it is larger than the sum of its proper divisors (229537599).

686825121 is a wasteful number, since it uses less digits than its factorization.

686825121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148975.

The product of its digits is 46080, while the sum is 39.

The square root of 686825121 is about 26207.3486068316. The cubic root of 686825121 is about 882.2981943787.

The spelling of 686825121 in words is "six hundred eighty-six million, eight hundred twenty-five thousand, one hundred twenty-one".