1091089385 has 8 divisors (see below), whose sum is σ = 1319617536. Its totient is φ = 865998000.

The previous prime is 1091089369. The next prime is 1091089397. The reversal of 1091089385 is 5839801901.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1091089385 - 2⁴ = 1091089369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 858491 + ... + 859760.

It is an arithmetic number, because the mean of its divisors is an integer number (164952192).

Almost surely, 2^1091089385 is an apocalyptic number.

It is an amenable number.

1091089385 is a deficient number, since it is larger than the sum of its proper divisors (228528151).

1091089385 is a wasteful number, since it uses less digits than its factorization.

1091089385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718383.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 1091089385 is about 33031.6421783719. The cubic root of 1091089385 is about 1029.4852063493.

The spelling of 1091089385 in words is "one billion, ninety-one million, eighty-nine thousand, three hundred eighty-five".