9111755561 has 2 divisors, whose sum is σ = 9111755562. Its totient is φ = 9111755560.

The previous prime is 9111755519. The next prime is 9111755563. The reversal of 9111755561 is 1655571119.

9111755561 is digitally balanced in base 2, 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., 9094483225 + 17272336 = 95365^2 + 4156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9111755561 is a prime.

Together with 9111755563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9111755563) 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 as a sum of consecutive naturals, namely, 4555877780 + 4555877781.

It is an arithmetic number, because the mean of its divisors is an integer number (4555877781).

Almost surely, 2^9111755561 is an apocalyptic number.

It is an amenable number.

9111755561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9111755561 is an equidigital number, since it uses as much as digits as its factorization.

9111755561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47250, while the sum is 41.

The square root of 9111755561 is about 95455.5161370992. The cubic root of 9111755561 is about 2088.6580948978.

The spelling of 9111755561 in words is "nine billion, one hundred eleven million, seven hundred fifty-five thousand, five hundred sixty-one".