9747721 has 2 divisors, whose sum is σ = 9747722. Its totient is φ = 9747720.

The previous prime is 9747701. The next prime is 9747737. The reversal of 9747721 is 1277479.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 3013696 = 2595^2 + 1736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9747721 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (9747701) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4873860 + 4873861.

It is an arithmetic number, because the mean of its divisors is an integer number (4873861).

Almost surely, 2^9747721 is an apocalyptic number.

It is an amenable number.

9747721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9747721 is an equidigital number, since it uses as much as digits as its factorization.

9747721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 37.

The square root of 9747721 is about 3122.1340458091. The cubic root of 9747721 is about 213.6162876782.

The spelling of 9747721 in words is "nine million, seven hundred forty-seven thousand, seven hundred twenty-one".