1109666491 has 2 divisors, whose sum is σ = 1109666492. Its totient is φ = 1109666490.

The previous prime is 1109666473. The next prime is 1109666501. The reversal of 1109666491 is 1946669011.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109666491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1109666401) 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, 554833245 + 554833246.

It is an arithmetic number, because the mean of its divisors is an integer number (554833246).

Almost surely, 2^1109666491 is an apocalyptic number.

1109666491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109666491 is an equidigital number, since it uses as much as digits as its factorization.

1109666491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1109666491 is about 33311.6569837047. The cubic root of 1109666491 is about 1035.2950969168.

The spelling of 1109666491 in words is "one billion, one hundred nine million, six hundred sixty-six thousand, four hundred ninety-one".