1109090989 has 2 divisors, whose sum is σ = 1109090990. Its totient is φ = 1109090988.

The previous prime is 1109090977. The next prime is 1109091031. The reversal of 1109090989 is 9890909011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704477764 + 404613225 = 26542^2 + 20115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109090989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109090189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554545494 + 554545495.

It is an arithmetic number, because the mean of its divisors is an integer number (554545495).

Almost surely, 2^1109090989 is an apocalyptic number.

It is an amenable number.

1109090989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109090989 is an equidigital number, since it uses as much as digits as its factorization.

1109090989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 1109090989 is about 33303.0177161170. The cubic root of 1109090989 is about 1035.1160889491.

The spelling of 1109090989 in words is "one billion, one hundred nine million, ninety thousand, nine hundred eighty-nine".