4917721 has 2 divisors, whose sum is σ = 4917722. Its totient is φ = 4917720.

The previous prime is 4917659. The next prime is 4917761. The reversal of 4917721 is 1277194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4862025 + 55696 = 2205^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 4917721 - 2⁷ = 4917593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4917761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2458860 + 2458861.

It is an arithmetic number, because the mean of its divisors is an integer number (2458861).

Almost surely, 2^4917721 is an apocalyptic number.

It is an amenable number.

4917721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4917721 is an equidigital number, since it uses as much as digits as its factorization.

4917721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 4917721 is about 2217.5935155028. The cubic root of 4917721 is about 170.0544347017.

The spelling of 4917721 in words is "four million, nine hundred seventeen thousand, seven hundred twenty-one".