681325 has 6 divisors (see below), whose sum is σ = 844874. Its totient is φ = 545040.

The previous prime is 681311. The next prime is 681337. The reversal of 681325 is 523186.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 44521 + 636804 = 211^2 + 798^2 .

It is not a de Polignac number, because 681325 - 2⁵ = 681293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 27253 = 681325 / (6 + 8 + 1 + 3 + 2 + 5).

It is a Duffinian number.

681325 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 681325.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13602 + ... + 13651.

2⁶⁸¹³²⁵ is an apocalyptic number.

It is an amenable number.

681325 is a deficient number, since it is larger than the sum of its proper divisors (163549).

681325 is a wasteful number, since it uses less digits than its factorization.

681325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27263 (or 27258 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 681325 is about 825.4241334005. The cubic root of 681325 is about 87.9936720656.

It can be divided in two parts, 68 and 1325, that multiplied together give a triangular number (90100 = T₄₂₄).

The spelling of 681325 in words is "six hundred eighty-one thousand, three hundred twenty-five".