9724165961 has 2 divisors, whose sum is σ = 9724165962. Its totient is φ = 9724165960.

The previous prime is 9724165907. The next prime is 9724165967. The reversal of 9724165961 is 1695614279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8784375625 + 939790336 = 93725^2 + 30656^2 .

It is an emirp because it is prime and its reverse (1695614279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9724165961 - 2⁶ = 9724165897 is a prime.

It is not a weakly prime, because it can be changed into another prime (9724165967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4862082980 + 4862082981.

It is an arithmetic number, because the mean of its divisors is an integer number (4862082981).

Almost surely, 2^9724165961 is an apocalyptic number.

It is an amenable number.

9724165961 is a deficient number, since it is larger than the sum of its proper divisors (1).

9724165961 is an equidigital number, since it uses as much as digits as its factorization.

9724165961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 9724165961 is about 98611.1857803160. The cubic root of 9724165961 is about 2134.4408337707.

The spelling of 9724165961 in words is "nine billion, seven hundred twenty-four million, one hundred sixty-five thousand, nine hundred sixty-one".