9661111189 has 2 divisors, whose sum is σ = 9661111190. Its totient is φ = 9661111188.

The previous prime is 9661111151. The next prime is 9661111217. The reversal of 9661111189 is 9811111669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8642863089 + 1018248100 = 92967^2 + 31910^2 .

It is a cyclic number.

It is not a de Polignac number, because 9661111189 - 2⁹ = 9661110677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661111139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830555594 + 4830555595.

It is an arithmetic number, because the mean of its divisors is an integer number (4830555595).

Almost surely, 2^9661111189 is an apocalyptic number.

It is an amenable number.

9661111189 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661111189 is an equidigital number, since it uses as much as digits as its factorization.

9661111189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 43.

The square root of 9661111189 is about 98290.9517147942. The cubic root of 9661111189 is about 2129.8173478090.

The spelling of 9661111189 in words is "nine billion, six hundred sixty-one million, one hundred eleven thousand, one hundred eighty-nine".