1100999789 has 2 divisors, whose sum is σ = 1100999790. Its totient is φ = 1100999788.

The previous prime is 1100999777. The next prime is 1100999791. The reversal of 1100999789 is 9879990011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097795689 + 3204100 = 33133^2 + 1790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100999789 is a prime.

Together with 1100999791, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1100999789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100999749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550499894 + 550499895.

It is an arithmetic number, because the mean of its divisors is an integer number (550499895).

Almost surely, 2^1100999789 is an apocalyptic number.

It is an amenable number.

1100999789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100999789 is an equidigital number, since it uses as much as digits as its factorization.

1100999789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 1100999789 is about 33181.3168665742. The cubic root of 1100999789 is about 1032.5927669055.

The spelling of 1100999789 in words is "one billion, one hundred million, nine hundred ninety-nine thousand, seven hundred eighty-nine".