1909109811 has 8 divisors (see below), whose sum is σ = 2909119744. Its totient is φ = 1090919880.

The previous prime is 1909109723. The next prime is 1909109819. The reversal of 1909109811 is 1189019091.

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

It is not a de Polignac number, because 1909109811 - 2¹³ = 1909101619 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 1909109811.

It is not an unprimeable number, because it can be changed into a prime (1909109819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45454975 + ... + 45455016.

It is an arithmetic number, because the mean of its divisors is an integer number (363639968).

Almost surely, 2^1909109811 is an apocalyptic number.

1909109811 is a deficient number, since it is larger than the sum of its proper divisors (1000009933).

1909109811 is an equidigital number, since it uses as much as digits as its factorization.

1909109811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90910001.

The product of its (nonzero) digits is 5832, while the sum is 39.

The square root of 1909109811 is about 43693.3611776435. The cubic root of 1909109811 is about 1240.5386601344.

The spelling of 1909109811 in words is "one billion, nine hundred nine million, one hundred nine thousand, eight hundred eleven".