6147721 has 2 divisors, whose sum is σ = 6147722. Its totient is φ = 6147720.

The previous prime is 6147653. The next prime is 6147737. The reversal of 6147721 is 1277416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3474496 + 2673225 = 1864^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 6147721 - 2⁷ = 6147593 is a prime.

6147721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6147721.

It is not a weakly prime, because it can be changed into another prime (6147751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3073860 + 3073861.

It is an arithmetic number, because the mean of its divisors is an integer number (3073861).

Almost surely, 2^6147721 is an apocalyptic number.

It is an amenable number.

6147721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6147721 is an equidigital number, since it uses as much as digits as its factorization.

6147721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 6147721 is about 2479.4598202028. The cubic root of 6147721 is about 183.1912460142.

The spelling of 6147721 in words is "six million, one hundred forty-seven thousand, seven hundred twenty-one".