9472721 has 2 divisors, whose sum is σ = 9472722. Its totient is φ = 9472720.

The previous prime is 9472717. The next prime is 9472747. The reversal of 9472721 is 1272749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 1849600 = 2761^2 + 1360^2 .

It is an emirp because it is prime and its reverse (1272749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9472721 - 2² = 9472717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (9472121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4736360 + 4736361.

It is an arithmetic number, because the mean of its divisors is an integer number (4736361).

Almost surely, 2^9472721 is an apocalyptic number.

It is an amenable number.

9472721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9472721 is an equidigital number, since it uses as much as digits as its factorization.

9472721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 9472721 is about 3077.7785820296. The cubic root of 9472721 is about 211.5882672706.

The spelling of 9472721 in words is "nine million, four hundred seventy-two thousand, seven hundred twenty-one".