685121586 has 16 divisors (see below), whose sum is σ = 1370530368. Its totient is φ = 228326000.

The previous prime is 685121581. The next prime is 685121587.

685121586 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (685121581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30811 + ... + 48161.

It is an arithmetic number, because the mean of its divisors is an integer number (85658148).

Almost surely, 2^685121586 is an apocalyptic number.

685121586 is an abundant number, since it is smaller than the sum of its proper divisors (685408782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685121586 is a wasteful number, since it uses less digits than its factorization.

685121586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23937.

The product of its digits is 115200, while the sum is 42.

The square root of 685121586 is about 26174.8273346741. The cubic root of 685121586 is about 881.5681345826.

The spelling of 685121586 in words is "six hundred eighty-five million, one hundred twenty-one thousand, five hundred eighty-six".