1091770779 has 12 divisors (see below), whose sum is σ = 1600061288. Its totient is φ = 661679040.

The previous prime is 1091770747. The next prime is 1091770781. The reversal of 1091770779 is 9770771901.

It is not a de Polignac number, because 1091770779 - 2⁵ = 1091770747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091770709) 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 in 11 ways as a sum of consecutive naturals, for example, 1503454 + ... + 1504179.

Almost surely, 2^1091770779 is an apocalyptic number.

1091770779 is a deficient number, since it is larger than the sum of its proper divisors (508290509).

1091770779 is a wasteful number, since it uses less digits than its factorization.

1091770779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007658 (or 3007647 counting only the distinct ones).

The product of its (nonzero) digits is 194481, while the sum is 48.

The square root of 1091770779 is about 33041.9548301852. The cubic root of 1091770779 is about 1029.6994689860.

The spelling of 1091770779 in words is "one billion, ninety-one million, seven hundred seventy thousand, seven hundred seventy-nine".