685384221 has 12 divisors (see below), whose sum is σ = 933711872. Its totient is φ = 447196728.

The previous prime is 685384213. The next prime is 685384241. The reversal of 685384221 is 122483586.

It is not a de Polignac number, because 685384221 - 2³ = 685384213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685384221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685384201) 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 11 ways as a sum of consecutive naturals, for example, 45085 + ... + 58338.

Almost surely, 2^685384221 is an apocalyptic number.

It is an amenable number.

685384221 is a deficient number, since it is larger than the sum of its proper divisors (248327651).

685384221 is a wasteful number, since it uses less digits than its factorization.

685384221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103520 (or 103473 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The square root of 685384221 is about 26179.8437925057. The cubic root of 685384221 is about 881.6807671785.

The spelling of 685384221 in words is "six hundred eighty-five million, three hundred eighty-four thousand, two hundred twenty-one".