9720911 has 2 divisors, whose sum is σ = 9720912. Its totient is φ = 9720910.

The previous prime is 9720901. The next prime is 9720917. The reversal of 9720911 is 1190279.

It is a strong prime.

It is an emirp because it is prime and its reverse (1190279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9720911 - 2¹⁸ = 9458767 is a prime.

It is a super-2 number, since 2×9720911² = 188992221339842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9720917) 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, 4860455 + 4860456.

It is an arithmetic number, because the mean of its divisors is an integer number (4860456).

Almost surely, 2^9720911 is an apocalyptic number.

9720911 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720911 is an equidigital number, since it uses as much as digits as its factorization.

9720911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 9720911 is about 3117.8375518939. The cubic root of 9720911 is about 213.4202654064.

The spelling of 9720911 in words is "nine million, seven hundred twenty thousand, nine hundred eleven".