6681305 has 4 divisors (see below), whose sum is σ = 8017572. Its totient is φ = 5345040.

The previous prime is 6681287. The next prime is 6681329. The reversal of 6681305 is 5031866.

6681305 is nontrivially palindromic in base 7.

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 3794704 + 2886601 = 1948^2 + 1699^2 .

It is not a de Polignac number, because 6681305 - 2¹⁶ = 6615769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668126 + ... + 668135.

It is an arithmetic number, because the mean of its divisors is an integer number (2004393).

Almost surely, 2^6681305 is an apocalyptic number.

It is an amenable number.

6681305 is a deficient number, since it is larger than the sum of its proper divisors (1336267).

6681305 is a wasteful number, since it uses less digits than its factorization.

6681305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336266.

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

The square root of 6681305 is about 2584.8220441647. The cubic root of 6681305 is about 188.3448570667.

The spelling of 6681305 in words is "six million, six hundred eighty-one thousand, three hundred five".