685217125 has 32 divisors (see below), whose sum is σ = 876736224. Its totient is φ = 534476800.

The previous prime is 685217123. The next prime is 685217179. The reversal of 685217125 is 521712586.

It can be written as a sum of positive squares in 16 ways, for example, as 254530116 + 430687009 = 15954^2 + 20753^2 .

It is not a de Polignac number, because 685217125 - 2¹ = 685217123 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 (685217123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1940949 + ... + 1941301.

It is an arithmetic number, because the mean of its divisors is an integer number (27398007).

Almost surely, 2^685217125 is an apocalyptic number.

It is an amenable number.

685217125 is a deficient number, since it is larger than the sum of its proper divisors (191519099).

685217125 is a wasteful number, since it uses less digits than its factorization.

685217125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 704 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 685217125 is about 26176.6522878691. The cubic root of 685217125 is about 881.6091103865.

The spelling of 685217125 in words is "six hundred eighty-five million, two hundred seventeen thousand, one hundred twenty-five".