681725 has 24 divisors (see below), whose sum is σ = 961248. Its totient is φ = 475200.

The previous prime is 681719. The next prime is 681727. The reversal of 681725 is 527186.

681725 = 66² + 67² + ... + 132².

It is a de Polignac number, because none of the positive numbers 2^k-681725 is a prime.

It is a Duffinian number.

Its product of digits (3360) is a multiple of the sum of its prime divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681727) 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 23 ways as a sum of consecutive naturals, for example, 10142 + ... + 10208.

It is an arithmetic number, because the mean of its divisors is an integer number (40052).

2⁶⁸¹⁷²⁵ is an apocalyptic number.

It is an amenable number.

681725 is a deficient number, since it is larger than the sum of its proper divisors (279523).

681725 is a wasteful number, since it uses less digits than its factorization.

681725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 120 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 681725 is about 825.6663975238. Note that the first 3 decimals coincide. The cubic root of 681725 is about 88.0108888041.

The spelling of 681725 in words is "six hundred eighty-one thousand, seven hundred twenty-five".