9979449509 has 2 divisors, whose sum is σ = 9979449510. Its totient is φ = 9979449508.

The previous prime is 9979449443. The next prime is 9979449563. The reversal of 9979449509 is 9059449799.

9979449509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7783121284 + 2196328225 = 88222^2 + 46865^2 .

It is a cyclic number.

It is not a de Polignac number, because 9979449509 - 2²⁰ = 9978400933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9979449209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989724754 + 4989724755.

It is an arithmetic number, because the mean of its divisors is an integer number (4989724755).

Almost surely, 2^9979449509 is an apocalyptic number.

It is an amenable number.

9979449509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979449509 is an equidigital number, since it uses as much as digits as its factorization.

9979449509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33067440, while the sum is 65.

The square root of 9979449509 is about 99897.1947003518. The cubic root of 9979449509 is about 2152.9578548896.

The spelling of 9979449509 in words is "nine billion, nine hundred seventy-nine million, four hundred forty-nine thousand, five hundred nine".