9191010161 has 2 divisors, whose sum is σ = 9191010162. Its totient is φ = 9191010160.

The previous prime is 9191010133. The next prime is 9191010209. The reversal of 9191010161 is 1610101919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7204614400 + 1986395761 = 84880^2 + 44569^2 .

It is an emirp because it is prime and its reverse (1610101919) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9191010161 is a prime.

It is not a weakly prime, because it can be changed into another prime (9191012161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595505080 + 4595505081.

It is an arithmetic number, because the mean of its divisors is an integer number (4595505081).

Almost surely, 2^9191010161 is an apocalyptic number.

It is an amenable number.

9191010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9191010161 is an equidigital number, since it uses as much as digits as its factorization.

9191010161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 29.

The square root of 9191010161 is about 95869.7562373035. The cubic root of 9191010161 is about 2094.6963795409.

The spelling of 9191010161 in words is "nine billion, one hundred ninety-one million, ten thousand, one hundred sixty-one".