2111888705 has 4 divisors (see below), whose sum is σ = 2534266452. Its totient is φ = 1689510960.

The previous prime is 2111888683. The next prime is 2111888707. The reversal of 2111888705 is 5078881112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 647142721 + 1464745984 = 25439^2 + 38272^2 .

It is not a de Polignac number, because 2111888705 - 2⁶ = 2111888641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111888707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211188866 + ... + 211188875.

It is an arithmetic number, because the mean of its divisors is an integer number (633566613).

Almost surely, 2^2111888705 is an apocalyptic number.

It is an amenable number.

2111888705 is a deficient number, since it is larger than the sum of its proper divisors (422377747).

2111888705 is an equidigital number, since it uses as much as digits as its factorization.

2111888705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422377746.

The product of its (nonzero) digits is 35840, while the sum is 41.

The square root of 2111888705 is about 45955.2902830566. The cubic root of 2111888705 is about 1282.9911948264.

The spelling of 2111888705 in words is "two billion, one hundred eleven million, eight hundred eighty-eight thousand, seven hundred five".