9721247 has 2 divisors, whose sum is σ = 9721248. Its totient is φ = 9721246.

The previous prime is 9721241. The next prime is 9721273. The reversal of 9721247 is 7421279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9721247 - 2⁶ = 9721183 is a prime.

It is equal to p₆₄₇₃₅₇ and since 9721247 and 647357 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9721241) 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, 4860623 + 4860624.

It is an arithmetic number, because the mean of its divisors is an integer number (4860624).

Almost surely, 2^9721247 is an apocalyptic number.

9721247 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721247 is an equidigital number, since it uses as much as digits as its factorization.

9721247 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 9721247 is about 3117.8914349284. The cubic root of 9721247 is about 213.4227243111.

Adding to 9721247 its sum of digits (32), we get a palindrome (9721279).

Subtracting from 9721247 its reverse (7421279), we obtain a cube (2299968 = 132³).

The spelling of 9721247 in words is "nine million, seven hundred twenty-one thousand, two hundred forty-seven".