1091106205 has 16 divisors (see below), whose sum is σ = 1507803264. Its totient is φ = 742472640.

The previous prime is 1091106169. The next prime is 1091106221. The reversal of 1091106205 is 5026011901.

It is not a de Polignac number, because 1091106205 - 2¹⁵ = 1091073437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091106205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114402 + ... + 123571.

It is an arithmetic number, because the mean of its divisors is an integer number (94237704).

Almost surely, 2^1091106205 is an apocalyptic number.

It is an amenable number.

1091106205 is a deficient number, since it is larger than the sum of its proper divisors (416697059).

1091106205 is a wasteful number, since it uses less digits than its factorization.

1091106205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238116.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1091106205 is about 33031.8967817472. The cubic root of 1091106205 is about 1029.4904964298.

The spelling of 1091106205 in words is "one billion, ninety-one million, one hundred six thousand, two hundred five".