681109 has 12 divisors (see below), whose sum is σ = 808108. Its totient is φ = 570240.

The previous prime is 681091. The next prime is 681113. The reversal of 681109 is 901186.

It can be written as a sum of positive squares in 2 ways, for example, as 88209 + 592900 = 297^2 + 770^2 .

It is not a de Polignac number, because 681109 - 2⁹ = 680597 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 (681179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1357 + ... + 1789.

2⁶⁸¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

681109 is a deficient number, since it is larger than the sum of its proper divisors (126999).

681109 is a wasteful number, since it uses less digits than its factorization.

681109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 681109 is about 825.2932812037. The cubic root of 681109 is about 87.9843722249.

The spelling of 681109 in words is "six hundred eighty-one thousand, one hundred nine".