1091766791 has 2 divisors, whose sum is σ = 1091766792. Its totient is φ = 1091766790.

The previous prime is 1091766749. The next prime is 1091766833. The reversal of 1091766791 is 1976671901.

It is a balanced prime because it is at equal distance from previous prime (1091766749) and next prime (1091766833).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091766791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091766721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545883395 + 545883396.

It is an arithmetic number, because the mean of its divisors is an integer number (545883396).

Almost surely, 2^1091766791 is an apocalyptic number.

1091766791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091766791 is an equidigital number, since it uses as much as digits as its factorization.

1091766791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 1091766791 is about 33041.8944826110. The cubic root of 1091766791 is about 1029.6982152288.

The spelling of 1091766791 in words is "one billion, ninety-one million, seven hundred sixty-six thousand, seven hundred ninety-one".