686125321 has 32 divisors (see below), whose sum is σ = 886152960. Its totient is φ = 517072896.

The previous prime is 686125309. The next prime is 686125331. The reversal of 686125321 is 123521686.

It is a cyclic number.

It is not a de Polignac number, because 686125321 - 2¹⁷ = 685994249 is a prime.

It is a super-2 number, since 2×686125321² = 941535912234706082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686125331) 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 31 ways as a sum of consecutive naturals, for example, 162975 + ... + 167131.

It is an arithmetic number, because the mean of its divisors is an integer number (27692280).

Almost surely, 2^686125321 is an apocalyptic number.

It is an amenable number.

686125321 is a deficient number, since it is larger than the sum of its proper divisors (200027639).

686125321 is a wasteful number, since it uses less digits than its factorization.

686125321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273.

The product of its digits is 17280, while the sum is 34.

The square root of 686125321 is about 26193.9939871719. The cubic root of 686125321 is about 881.9984372910.

The spelling of 686125321 in words is "six hundred eighty-six million, one hundred twenty-five thousand, three hundred twenty-one".