9909789461 has 16 divisors (see below), whose sum is σ = 11773097280. Its totient is φ = 8222459520.

The previous prime is 9909789457. The next prime is 9909789469. The reversal of 9909789461 is 1649879099.

It is a happy number.

9909789461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9909789461 - 2² = 9909789457 is a prime.

It is a super-2 number, since 2×9909789461² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9909789394 and 9909789403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909789469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376595 + ... + 402048.

It is an arithmetic number, because the mean of its divisors is an integer number (735818580).

Almost surely, 2^9909789461 is an apocalyptic number.

It is an amenable number.

9909789461 is a deficient number, since it is larger than the sum of its proper divisors (1863307819).

9909789461 is a wasteful number, since it uses less digits than its factorization.

9909789461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778756.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 9909789461 is about 99547.9254479972. The cubic root of 9909789461 is about 2147.9366872515.

The spelling of 9909789461 in words is "nine billion, nine hundred nine million, seven hundred eighty-nine thousand, four hundred sixty-one".