1121100209 has 4 divisors (see below), whose sum is σ = 1121224740. Its totient is φ = 1120975680.

The previous prime is 1121100193. The next prime is 1121100289. The reversal of 1121100209 is 9020011211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9020011211 = 67 ⋅134627033.

It can be written as a sum of positive squares in 2 ways, for example, as 118744609 + 1002355600 = 10897^2 + 31660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121100209 - 2⁴ = 1121100193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121100289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47612 + ... + 67149.

It is an arithmetic number, because the mean of its divisors is an integer number (280306185).

Almost surely, 2^1121100209 is an apocalyptic number.

It is an amenable number.

1121100209 is a deficient number, since it is larger than the sum of its proper divisors (124531).

1121100209 is an equidigital number, since it uses as much as digits as its factorization.

1121100209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124530.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1121100209 is about 33482.8345424936. The cubic root of 1121100209 is about 1038.8387584141.

The spelling of 1121100209 in words is "one billion, one hundred twenty-one million, one hundred thousand, two hundred nine".