1109109091 has 2 divisors, whose sum is σ = 1109109092. Its totient is φ = 1109109090.

The previous prime is 1109109049. The next prime is 1109109101. The reversal of 1109109091 is 1909019011.

It is a strong prime.

It is an emirp because it is prime and its reverse (1909019011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109109091 - 2¹⁵ = 1109076323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1109106091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554554545 + 554554546.

It is an arithmetic number, because the mean of its divisors is an integer number (554554546).

Almost surely, 2^1109109091 is an apocalyptic number.

1109109091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109109091 is an equidigital number, since it uses as much as digits as its factorization.

1109109091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 1109109091 is about 33303.2894921808. The cubic root of 1109109091 is about 1035.1217204586.

The spelling of 1109109091 in words is "one billion, one hundred nine million, one hundred nine thousand, ninety-one".