9791228161 has 24 divisors (see below), whose sum is σ = 11610530792. Its totient is φ = 8201952000.

The previous prime is 9791228137. The next prime is 9791228171. The reversal of 9791228161 is 1618221979.

It can be written as a sum of positive squares in 4 ways, for example, as 1375000561 + 8416227600 = 37081^2 + 91740^2 .

It is not a de Polignac number, because 9791228161 - 2⁷ = 9791228033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9791228131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 940195 + ... + 950551.

Almost surely, 2^9791228161 is an apocalyptic number.

It is an amenable number.

9791228161 is a deficient number, since it is larger than the sum of its proper divisors (1819302631).

9791228161 is a wasteful number, since it uses less digits than its factorization.

9791228161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993 (or 10982 counting only the distinct ones).

The product of its digits is 108864, while the sum is 46.

The square root of 9791228161 is about 98950.6349701709. The cubic root of 9791228161 is about 2139.3362836025.

The spelling of 9791228161 in words is "nine billion, seven hundred ninety-one million, two hundred twenty-eight thousand, one hundred sixty-one".