1109023189 has 2 divisors, whose sum is σ = 1109023190. Its totient is φ = 1109023188.

The previous prime is 1109023187. The next prime is 1109023207. The reversal of 1109023189 is 9813209011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038966289 + 70056900 = 32233^2 + 8370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109023189 - 2¹ = 1109023187 is a prime.

Together with 1109023187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109023187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554511594 + 554511595.

It is an arithmetic number, because the mean of its divisors is an integer number (554511595).

Almost surely, 2^1109023189 is an apocalyptic number.

It is an amenable number.

1109023189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109023189 is an equidigital number, since it uses as much as digits as its factorization.

1109023189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1109023189 is about 33301.9997747883. Note that the first 3 decimals coincide. The cubic root of 1109023189 is about 1035.0949959093.

The spelling of 1109023189 in words is "one billion, one hundred nine million, twenty-three thousand, one hundred eighty-nine".