685061221 has 8 divisors (see below), whose sum is σ = 742178304. Its totient is φ = 628575600.

The previous prime is 685061183. The next prime is 685061231. The reversal of 685061221 is 122160586.

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 685061221 - 2²⁷ = 550843493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685061231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155605 + ... + 159946.

It is an arithmetic number, because the mean of its divisors is an integer number (92772288).

Almost surely, 2^685061221 is an apocalyptic number.

It is an amenable number.

685061221 is a deficient number, since it is larger than the sum of its proper divisors (57117083).

685061221 is a wasteful number, since it uses less digits than its factorization.

685061221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315731.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 685061221 is about 26173.6741975597. The cubic root of 685061221 is about 881.5422426219.

The spelling of 685061221 in words is "six hundred eighty-five million, sixty-one thousand, two hundred twenty-one".