1090919909 has 4 divisors (see below), whose sum is σ = 1102166604. Its totient is φ = 1079673216.

The previous prime is 1090919861. The next prime is 1090919911. The reversal of 1090919909 is 9099190901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9099190901 = 4349 ⋅2092249.

It can be written as a sum of positive squares in 2 ways, for example, as 715723009 + 375196900 = 26753^2 + 19370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090919909 - 2⁸ = 1090919653 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 (1090919309) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5623202 + ... + 5623395.

It is an arithmetic number, because the mean of its divisors is an integer number (275541651).

Almost surely, 2^1090919909 is an apocalyptic number.

It is an amenable number.

1090919909 is a deficient number, since it is larger than the sum of its proper divisors (11246695).

1090919909 is an equidigital number, since it uses as much as digits as its factorization.

1090919909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11246694.

The product of its (nonzero) digits is 59049, while the sum is 47.

The square root of 1090919909 is about 33029.0767203687. The cubic root of 1090919909 is about 1029.4319011934.

The spelling of 1090919909 in words is "one billion, ninety million, nine hundred nineteen thousand, nine hundred nine".