1109890791 has 12 divisors (see below), whose sum is σ = 1629457960. Its totient is φ = 727796880.

The previous prime is 1109890763. The next prime is 1109890811. The reversal of 1109890791 is 1970989011.

It is not a de Polignac number, because 1109890791 - 2¹⁷ = 1109759719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109890741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1010281 + ... + 1011378.

Almost surely, 2^1109890791 is an apocalyptic number.

1109890791 is a deficient number, since it is larger than the sum of its proper divisors (519567169).

1109890791 is a wasteful number, since it uses less digits than its factorization.

1109890791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021726 (or 2021723 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 1109890791 is about 33315.0235029183. The cubic root of 1109890791 is about 1035.3648479179.

The spelling of 1109890791 in words is "one billion, one hundred nine million, eight hundred ninety thousand, seven hundred ninety-one".