1091804459 has 4 divisors (see below), whose sum is σ = 1094338080. Its totient is φ = 1089270840.

The previous prime is 1091804453. The next prime is 1091804477. The reversal of 1091804459 is 9544081901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9544081901 = 53 ⋅180077017.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091804459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091804453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266164 + ... + 1267025.

It is an arithmetic number, because the mean of its divisors is an integer number (273584520).

Almost surely, 2^1091804459 is an apocalyptic number.

1091804459 is a deficient number, since it is larger than the sum of its proper divisors (2533621).

1091804459 is an equidigital number, since it uses as much as digits as its factorization.

1091804459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533620.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1091804459 is about 33042.4644813307. The cubic root of 1091804459 is about 1029.7100572652.

The spelling of 1091804459 in words is "one billion, ninety-one million, eight hundred four thousand, four hundred fifty-nine".