7051721 has 2 divisors, whose sum is σ = 7051722. Its totient is φ = 7051720.

The previous prime is 7051711. The next prime is 7051729. The reversal of 7051721 is 1271507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 55696 = 2645^2 + 236^2 .

It is an emirp because it is prime and its reverse (1271507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7051721 - 2¹⁰ = 7050697 is a prime.

It is not a weakly prime, because it can be changed into another prime (7051729) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3525860 + 3525861.

It is an arithmetic number, because the mean of its divisors is an integer number (3525861).

Almost surely, 2^7051721 is an apocalyptic number.

It is an amenable number.

7051721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7051721 is an equidigital number, since it uses as much as digits as its factorization.

7051721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 7051721 is about 2655.5076727436. The cubic root of 7051721 is about 191.7630993840.

The spelling of 7051721 in words is "seven million, fifty-one thousand, seven hundred twenty-one".