681025 has 6 divisors (see below), whose sum is σ = 844502. Its totient is φ = 544800.

The previous prime is 681019. The next prime is 681041. The reversal of 681025 is 520186.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 229441 + 451584 = 479^2 + 672^2 .

It is not a de Polignac number, because 681025 - 2⁵ = 680993 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 680987 and 681005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13596 + ... + 13645.

2⁶⁸¹⁰²⁵ is an apocalyptic number.

It is an amenable number.

681025 is a deficient number, since it is larger than the sum of its proper divisors (163477).

681025 is a wasteful number, since it uses less digits than its factorization.

681025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27251 (or 27246 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 681025 is about 825.2423886350. The cubic root of 681025 is about 87.9807550891.

The spelling of 681025 in words is "six hundred eighty-one thousand, twenty-five".