6681205 has 4 divisors (see below), whose sum is σ = 8017452. Its totient is φ = 5344960.

The previous prime is 6681203. The next prime is 6681209. The reversal of 6681205 is 5021866.

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 964324 + 5716881 = 982^2 + 2391^2 .

It is not a de Polignac number, because 6681205 - 2¹ = 6681203 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 (6681203) 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, 668116 + ... + 668125.

It is an arithmetic number, because the mean of its divisors is an integer number (2004363).

Almost surely, 2^6681205 is an apocalyptic number.

It is an amenable number.

6681205 is a deficient number, since it is larger than the sum of its proper divisors (1336247).

6681205 is a wasteful number, since it uses less digits than its factorization.

6681205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336246.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 6681205 is about 2584.8027004009. The cubic root of 6681205 is about 188.3439174010.

It can be divided in two parts, 6681 and 205, that added together give a palindrome (6886).

The spelling of 6681205 in words is "six million, six hundred eighty-one thousand, two hundred five".