1091320775 has 12 divisors (see below), whose sum is σ = 1354935600. Its totient is φ = 871961280.

The previous prime is 1091320709. The next prime is 1091320781. The reversal of 1091320775 is 5770231901.

It is a happy number.

It is not a de Polignac number, because 1091320775 - 2¹⁰ = 1091319751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6755 + ... + 47204.

It is an arithmetic number, because the mean of its divisors is an integer number (112911300).

Almost surely, 2^1091320775 is an apocalyptic number.

1091320775 is a deficient number, since it is larger than the sum of its proper divisors (263614825).

1091320775 is an equidigital number, since it uses as much as digits as its factorization.

1091320775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54778 (or 54773 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 35.

The square root of 1091320775 is about 33035.1445433496. The cubic root of 1091320775 is about 1029.5579763556.

The spelling of 1091320775 in words is "one billion, ninety-one million, three hundred twenty thousand, seven hundred seventy-five".