9947783509 has 2 divisors, whose sum is σ = 9947783510. Its totient is φ = 9947783508.

The previous prime is 9947783497. The next prime is 9947783513. The reversal of 9947783509 is 9053877499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9580102884 + 367680625 = 97878^2 + 19175^2 .

It is an emirp because it is prime and its reverse (9053877499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9947783509 - 2¹¹ = 9947781461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9947703509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973891754 + 4973891755.

It is an arithmetic number, because the mean of its divisors is an integer number (4973891755).

Almost surely, 2^9947783509 is an apocalyptic number.

It is an amenable number.

9947783509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947783509 is an equidigital number, since it uses as much as digits as its factorization.

9947783509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The square root of 9947783509 is about 99738.5758320220. The cubic root of 9947783509 is about 2150.6782434899.

The spelling of 9947783509 in words is "nine billion, nine hundred forty-seven million, seven hundred eighty-three thousand, five hundred nine".