1909091437811 has 4 divisors (see below), whose sum is σ = 1992095413392. Its totient is φ = 1826087462232.

The previous prime is 1909091437807. The next prime is 1909091437829. The reversal of 1909091437811 is 1187341909091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1909091437811 - 2² = 1909091437807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909091437801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41501987756 + ... + 41501987801.

It is an arithmetic number, because the mean of its divisors is an integer number (498023853348).

Almost surely, 2^{1909091437811} is an apocalyptic number.

1909091437811 is a deficient number, since it is larger than the sum of its proper divisors (83003975581).

1909091437811 is an equidigital number, since it uses as much as digits as its factorization.

1909091437811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83003975580.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 1909091437811 in words is "one trillion, nine hundred nine billion, ninety-one million, four hundred thirty-seven thousand, eight hundred eleven".