6225721 has 4 divisors (see below), whose sum is σ = 6327844. Its totient is φ = 6123600.

The previous prime is 6225719. The next prime is 6225733. The reversal of 6225721 is 1275226.

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 1297321 + 4928400 = 1139^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 6225721 - 2¹ = 6225719 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 (6225701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50970 + ... + 51091.

It is an arithmetic number, because the mean of its divisors is an integer number (1581961).

Almost surely, 2^6225721 is an apocalyptic number.

6225721 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6225721 is a deficient number, since it is larger than the sum of its proper divisors (102123).

6225721 is a wasteful number, since it uses less digits than its factorization.

6225721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102122.

The product of its digits is 1680, while the sum is 25.

The square root of 6225721 is about 2495.1394750595. The cubic root of 6225721 is about 183.9627464750.

The spelling of 6225721 in words is "six million, two hundred twenty-five thousand, seven hundred twenty-one".