6255721 has 4 divisors (see below), whose sum is σ = 6326100. Its totient is φ = 6185344.

The previous prime is 6255719. The next prime is 6255737. The reversal of 6255721 is 1275526.

6255721 is digitally balanced in base 3, 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 4326400 + 1929321 = 2080^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 6255721 - 2¹ = 6255719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6255721.

It is not an unprimeable number, because it can be changed into a prime (6255751) 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, 35056 + ... + 35233.

It is an arithmetic number, because the mean of its divisors is an integer number (1581525).

Almost surely, 2^6255721 is an apocalyptic number.

It is an amenable number.

6255721 is a deficient number, since it is larger than the sum of its proper divisors (70379).

6255721 is an equidigital number, since it uses as much as digits as its factorization.

6255721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70378.

The product of its digits is 4200, while the sum is 28.

The square root of 6255721 is about 2501.1439382810. The cubic root of 6255721 is about 184.2577613764.

The spelling of 6255721 in words is "six million, two hundred fifty-five thousand, seven hundred twenty-one".