9721169 has 2 divisors, whose sum is σ = 9721170. Its totient is φ = 9721168.

The previous prime is 9721163. The next prime is 9721181. The reversal of 9721169 is 9611279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8340544 + 1380625 = 2888^2 + 1175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9721169 is a prime.

It is a super-2 number, since 2×9721169² = 189002253453122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9721163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860584 + 4860585.

It is an arithmetic number, because the mean of its divisors is an integer number (4860585).

Almost surely, 2^9721169 is an apocalyptic number.

It is an amenable number.

9721169 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721169 is an equidigital number, since it uses as much as digits as its factorization.

9721169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 9721169 is about 3117.8789264498. The cubic root of 9721169 is about 213.4221534990.

The spelling of 9721169 in words is "nine million, seven hundred twenty-one thousand, one hundred sixty-nine".