9491628161 has 2 divisors, whose sum is σ = 9491628162. Its totient is φ = 9491628160.

The previous prime is 9491628137. The next prime is 9491628197. The reversal of 9491628161 is 1618261949.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8753473600 + 738154561 = 93560^2 + 27169^2 .

It is a cyclic number.

It is not a de Polignac number, because 9491628161 - 2¹⁴ = 9491611777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9491628131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745814080 + 4745814081.

It is an arithmetic number, because the mean of its divisors is an integer number (4745814081).

Almost surely, 2^9491628161 is an apocalyptic number.

It is an amenable number.

9491628161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491628161 is an equidigital number, since it uses as much as digits as its factorization.

9491628161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 9491628161 is about 97424.9873543743. The cubic root of 9491628161 is about 2117.2894753732.

The spelling of 9491628161 in words is "nine billion, four hundred ninety-one million, six hundred twenty-eight thousand, one hundred sixty-one".