685001305 has 4 divisors (see below), whose sum is σ = 822001572. Its totient is φ = 548001040.

The previous prime is 685001279. The next prime is 685001311. The reversal of 685001305 is 503100586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204690249 + 480311056 = 14307^2 + 21916^2 .

It is not a de Polignac number, because 685001305 - 2²⁷ = 550783577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68500126 + ... + 68500135.

It is an arithmetic number, because the mean of its divisors is an integer number (205500393).

Almost surely, 2^685001305 is an apocalyptic number.

It is an amenable number.

685001305 is a deficient number, since it is larger than the sum of its proper divisors (137000267).

685001305 is a wasteful number, since it uses less digits than its factorization.

685001305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137000266.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 685001305 is about 26172.5295873364. The cubic root of 685001305 is about 881.5165417438.

The spelling of 685001305 in words is "six hundred eighty-five million, one thousand, three hundred five".