1111661105 has 4 divisors (see below), whose sum is σ = 1333993332. Its totient is φ = 889328880.

The previous prime is 1111661071. The next prime is 1111661107. The reversal of 1111661105 is 5011661111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5011661111 = 89 ⋅56310799.

It can be written as a sum of positive squares in 2 ways, for example, as 295530481 + 816130624 = 17191^2 + 28568^2 .

It is not a de Polignac number, because 1111661105 - 2¹⁸ = 1111398961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111661107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111166106 + ... + 111166115.

It is an arithmetic number, because the mean of its divisors is an integer number (333498333).

Almost surely, 2^1111661105 is an apocalyptic number.

It is an amenable number.

1111661105 is a deficient number, since it is larger than the sum of its proper divisors (222332227).

1111661105 is an equidigital number, since it uses as much as digits as its factorization.

1111661105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222332226.

The product of its (nonzero) digits is 180, while the sum is 23.

The square root of 1111661105 is about 33341.5822210044. The cubic root of 1111661105 is about 1035.9150363505.

The spelling of 1111661105 in words is "one billion, one hundred eleven million, six hundred sixty-one thousand, one hundred five".