1109788279 has 2 divisors, whose sum is σ = 1109788280. Its totient is φ = 1109788278.

The previous prime is 1109788231. The next prime is 1109788297. The reversal of 1109788279 is 9728879011.

Together with next prime (1109788297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (9728879011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1109788279 - 2¹⁷ = 1109657207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109798279) 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 as a sum of consecutive naturals, namely, 554894139 + 554894140.

It is an arithmetic number, because the mean of its divisors is an integer number (554894140).

Almost surely, 2^1109788279 is an apocalyptic number.

1109788279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109788279 is an equidigital number, since it uses as much as digits as its factorization.

1109788279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 52.

The square root of 1109788279 is about 33313.4849422873. The cubic root of 1109788279 is about 1035.3329707308.

The spelling of 1109788279 in words is "one billion, one hundred nine million, seven hundred eighty-eight thousand, two hundred seventy-nine".