681365 has 4 divisors (see below), whose sum is σ = 817644. Its totient is φ = 545088.

The previous prime is 681361. The next prime is 681367. The reversal of 681365 is 563186.

681365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 357604 + 323761 = 598^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 681365 - 2² = 681361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681365.

It is not an unprimeable number, because it can be changed into a prime (681361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68132 + ... + 68141.

It is an arithmetic number, because the mean of its divisors is an integer number (204411).

2⁶⁸¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

681365 is a deficient number, since it is larger than the sum of its proper divisors (136279).

681365 is a wasteful number, since it uses less digits than its factorization.

681365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136278.

The product of its digits is 4320, while the sum is 29.

The square root of 681365 is about 825.4483630125. The cubic root of 681365 is about 87.9953940427.

The spelling of 681365 in words is "six hundred eighty-one thousand, three hundred sixty-five".