2111809043 has 4 divisors (see below), whose sum is σ = 2140738008. Its totient is φ = 2082880080.

The previous prime is 2111809033. The next prime is 2111809057. The reversal of 2111809043 is 3409081112.

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 2111809043 - 2⁴ = 2111809027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111808997 and 2111809015.

It is not an unprimeable number, because it can be changed into a prime (2111809033) 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, 14464373 + ... + 14464518.

It is an arithmetic number, because the mean of its divisors is an integer number (535184502).

Almost surely, 2^2111809043 is an apocalyptic number.

2111809043 is a deficient number, since it is larger than the sum of its proper divisors (28928965).

2111809043 is an equidigital number, since it uses as much as digits as its factorization.

2111809043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28928964.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 2111809043 is about 45954.4235411565. The cubic root of 2111809043 is about 1282.9750628321.

The spelling of 2111809043 in words is "two billion, one hundred eleven million, eight hundred nine thousand, forty-three".