9725228509 has 2 divisors, whose sum is σ = 9725228510. Its totient is φ = 9725228508.

The previous prime is 9725228477. The next prime is 9725228521. The reversal of 9725228509 is 9058225279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6900624900 + 2824603609 = 83070^2 + 53147^2 .

It is an emirp because it is prime and its reverse (9058225279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9725228509 - 2⁵ = 9725228477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9725228599) 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, 4862614254 + 4862614255.

It is an arithmetic number, because the mean of its divisors is an integer number (4862614255).

Almost surely, 2^9725228509 is an apocalyptic number.

It is an amenable number.

9725228509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9725228509 is an equidigital number, since it uses as much as digits as its factorization.

9725228509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 9725228509 is about 98616.5731963953. The cubic root of 9725228509 is about 2134.5185735394.

The spelling of 9725228509 in words is "nine billion, seven hundred twenty-five million, two hundred twenty-eight thousand, five hundred nine".